diff --git a/CHANGELOG.md b/CHANGELOG.md
index fc04ada7..29fbbc39 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Change Log
 
+## [1.4.0] - 2020-08-24
+
+- Added set `lastmod` date command
+- [#16](https://github.com/estruyf/vscode-front-matter/issues/16): Fixed hardcoded length value
+
 ## [1.3.0] - 2020-08-22
 
 - Added SEO description warning when over 140 characters is used
@@ -61,4 +66,4 @@
 
 ## [0.0.1] - 2019-08-26
 
-- Initial beta version
\ No newline at end of file
+- Initial beta version
diff --git a/README.md b/README.md
index 2be12568..ee1be51f 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,12 @@ Update the `date` property of the current article/post/... to the current date &
 
 **Optional**: if you want, you can specify the date property format by adding your preference in your settings. Settings key: `frontMatter.taxonomy.dateFormat`. Check [date-fns formatting](https://date-fns.org/v2.0.1/docs/format) for more information on which patterns you can use.
 
+**Front Matter: Set lastmod date**
+
+Update the `lastmod` (last modified) property of the current article/post/... to the current date & time.
+
+> **note**: Uses the same date format settings key as current date: `frontMatter.taxonomy.dateFormat`.
+
 **Front Matter: Generate slug based on article title**
 
 This command generates a clean slug for your article. It removes known stop words, punctuations, and special characters. 
@@ -105,4 +111,4 @@ The extension has more settings that allow you to configure it to your needs fur
 
 ## Feedback / issues / ideas
 
-Please submit them via creating an issue in the project repository: [issue list](https://github.com/estruyf/vscode-front-matter/issues).
\ No newline at end of file
+Please submit them via creating an issue in the project repository: [issue list](https://github.com/estruyf/vscode-front-matter/issues).
diff --git a/package-lock.json b/package-lock.json
index ad458104..5c27c077 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -325,24 +325,14 @@
 			}
 		},
 		"anymatch": {
-			"version": "2.0.0",
-			"resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
-			"integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
+			"version": "3.1.1",
+			"resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
+			"integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
 			"dev": true,
+			"optional": true,
 			"requires": {
-				"micromatch": "^3.1.4",
-				"normalize-path": "^2.1.1"
-			},
-			"dependencies": {
-				"normalize-path": {
-					"version": "2.1.1",
-					"resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
-					"integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
-					"dev": true,
-					"requires": {
-						"remove-trailing-separator": "^1.0.1"
-					}
-				}
+				"normalize-path": "^3.0.0",
+				"picomatch": "^2.0.4"
 			}
 		},
 		"aproba": {
@@ -432,7 +422,8 @@
 			"version": "1.0.3",
 			"resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
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-			"dev": true
+			"dev": true,
+			"optional": true
 		},
 		"atob": {
 			"version": "2.1.2",
@@ -514,10 +505,21 @@
 			"dev": true
 		},
 		"binary-extensions": {
-			"version": "1.13.1",
-			"resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
-			"integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==",
-			"dev": true
+			"version": "2.1.0",
+			"resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.1.0.tgz",
+			"integrity": "sha512-1Yj8h9Q+QDF5FzhMs/c9+6UntbD5MkRfRwac8DoEm9ZfUBZ7tZ55YcGVAzEe4bXsdQHEk+s9S5wsOKVdZrw0tQ==",
+			"dev": true,
+			"optional": true
+		},
+		"bindings": {
+			"version": "1.5.0",
+			"resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
+			"integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
+			"dev": true,
+			"optional": true,
+			"requires": {
+				"file-uri-to-path": "1.0.0"
+			}
 		},
 		"bluebird": {
 			"version": "3.7.2",
@@ -746,23 +748,59 @@
 			}
 		},
 		"chokidar": {
-			"version": "2.1.8",
-			"resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
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+			"version": "3.4.2",
+			"resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.4.2.tgz",
+			"integrity": "sha512-IZHaDeBeI+sZJRX7lGcXsdzgvZqKv6sECqsbErJA4mHWfpRrD8B97kSFN4cQz6nGBGiuFia1MKR4d6c1o8Cv7A==",
 			"dev": true,
+			"optional": true,
 			"requires": {
-				"anymatch": "^2.0.0",
-				"async-each": "^1.0.1",
-				"braces": "^2.3.2",
-				"fsevents": "^1.2.7",
-				"glob-parent": "^3.1.0",
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-				"path-is-absolute": "^1.0.0",
-				"readdirp": "^2.2.1",
-				"upath": "^1.1.1"
+				"anymatch": "~3.1.1",
+				"braces": "~3.0.2",
+				"fsevents": "~2.1.2",
+				"glob-parent": "~5.1.0",
+				"is-binary-path": "~2.1.0",
+				"is-glob": "~4.0.1",
+				"normalize-path": "~3.0.0",
+				"readdirp": "~3.4.0"
+			},
+			"dependencies": {
+				"braces": {
+					"version": "3.0.2",
+					"resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+					"integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+					"dev": true,
+					"optional": true,
+					"requires": {
+						"fill-range": "^7.0.1"
+					}
+				},
+				"fill-range": {
+					"version": "7.0.1",
+					"resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
+					"integrity": "sha512-qOo9F+dMUmC2Lcb4BbVvnKJxTPjCm+RRpe4gDuGrzkL7mEVl/djYSu2OdQ2Pa302N4oqkSg9ir6jaLWJ2USVpQ==",
+					"dev": true,
+					"optional": true,
+					"requires": {
+						"to-regex-range": "^5.0.1"
+					}
+				},
+				"is-number": {
+					"version": "7.0.0",
+					"resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
+					"integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
+					"dev": true,
+					"optional": true
+				},
+				"to-regex-range": {
+					"version": "5.0.1",
+					"resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
+					"integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+					"dev": true,
+					"optional": true,
+					"requires": {
+						"is-number": "^7.0.0"
+					}
+				}
 			}
 		},
 		"chownr": {
@@ -1444,6 +1482,13 @@
 			"integrity": "sha512-0btnI/H8f2pavGMN8w40mlSKOfTK2SVJmBfBeVIj3kNw0swwgzyRq0d5TJVOwodFmtvpPeWPN/MCcfuWF0Ezbw==",
 			"dev": true
 		},
+		"file-uri-to-path": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
+			"integrity": "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw==",
+			"dev": true,
+			"optional": true
+		},
 		"fill-range": {
 			"version": "4.0.0",
 			"resolved": "https://registry.npmjs.org/fill-range/-/fill-range-4.0.0.tgz",
@@ -1551,552 +1596,11 @@
 			"dev": true
 		},
 		"fsevents": {
-			"version": "1.2.9",
-			"resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.9.tgz",
-			"integrity": "sha512-oeyj2H3EjjonWcFjD5NvZNE9Rqe4UW+nQBU2HNeKw0koVLEFIhtyETyAakeAM3de7Z/SW5kcA+fZUait9EApnw==",
+			"version": "2.1.3",
+			"resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.1.3.tgz",
+			"integrity": "sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ==",
 			"dev": true,
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-				"nan": "^2.12.1",
-				"node-pre-gyp": "^0.12.0"
-			},
-			"dependencies": {
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-					"version": "1.1.1",
-					"bundled": true,
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-					"bundled": true,
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-					"version": "1.2.0",
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-				"are-we-there-yet": {
-					"version": "1.1.5",
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+					"dev": true,
+					"optional": true
+				},
+				"chokidar": {
+					"version": "2.1.8",
+					"resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
+					"integrity": "sha512-ZmZUazfOzf0Nve7duiCKD23PFSCs4JPoYyccjUFF3aQkQadqBhfzhjkwBH2mNOG9cTBwhamM37EIsIkZw3nRgg==",
+					"dev": true,
+					"optional": true,
+					"requires": {
+						"anymatch": "^2.0.0",
+						"async-each": "^1.0.1",
+						"braces": "^2.3.2",
+						"fsevents": "^1.2.7",
+						"glob-parent": "^3.1.0",
+						"inherits": "^2.0.3",
+						"is-binary-path": "^1.0.0",
+						"is-glob": "^4.0.0",
+						"normalize-path": "^3.0.0",
+						"path-is-absolute": "^1.0.0",
+						"readdirp": "^2.2.1",
+						"upath": "^1.1.1"
+					}
+				},
+				"fsevents": {
+					"version": "1.2.13",
+					"resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.13.tgz",
+					"integrity": "sha512-oWb1Z6mkHIskLzEJ/XWX0srkpkTQ7vaopMQkyaEIoq0fmtFVxOthb8cCxeT+p3ynTdkk/RZwbgG4brR5BeWECw==",
+					"dev": true,
+					"optional": true,
+					"requires": {
+						"bindings": "^1.5.0",
+						"nan": "^2.12.1"
+					}
+				},
+				"glob-parent": {
+					"version": "3.1.0",
+					"resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
+					"integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
+					"dev": true,
+					"optional": true,
+					"requires": {
+						"is-glob": "^3.1.0",
+						"path-dirname": "^1.0.0"
+					},
+					"dependencies": {
+						"is-glob": {
+							"version": "3.1.0",
+							"resolved": "https://registry.npmjs.org/is-glob/-/is-glob-3.1.0.tgz",
+							"integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=",
+							"dev": true,
+							"optional": true,
+							"requires": {
+								"is-extglob": "^2.1.0"
+							}
+						}
+					}
+				},
+				"is-binary-path": {
+					"version": "1.0.1",
+					"resolved": "https://registry.npmjs.org/is-binary-path/-/is-binary-path-1.0.1.tgz",
+					"integrity": "sha1-dfFmQrSA8YenEcgUFh/TpKdlWJg=",
+					"dev": true,
+					"optional": true,
+					"requires": {
+						"binary-extensions": "^1.0.0"
+					}
+				},
+				"readdirp": {
+					"version": "2.2.1",
+					"resolved": "https://registry.npmjs.org/readdirp/-/readdirp-2.2.1.tgz",
+					"integrity": "sha512-1JU/8q+VgFZyxwrJ+SVIOsh+KywWGpds3NTqikiKpDMZWScmAYyKIgqkO+ARvNWJfXeXR1zxz7aHF4u4CyH6vQ==",
+					"dev": true,
+					"optional": true,
+					"requires": {
+						"graceful-fs": "^4.1.11",
+						"micromatch": "^3.1.10",
+						"readable-stream": "^2.0.2"
+					}
+				}
 			}
 		},
 		"webpack": {
@@ -4711,9 +4367,9 @@
 					}
 				},
 				"yargs-parser": {
-					"version": "13.1.1",
-					"resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
-					"integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+					"version": "13.1.2",
+					"resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+					"integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
 					"dev": true,
 					"requires": {
 						"camelcase": "^5.0.0",
@@ -4892,9 +4548,9 @@
 			}
 		},
 		"yargs-parser": {
-			"version": "13.0.0",
-			"resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
-			"integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
+			"version": "13.1.2",
+			"resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+			"integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
 			"dev": true,
 			"requires": {
 				"camelcase": "^5.0.0",
diff --git a/package.json b/package.json
index 36c138ea..a45ae41b 100644
--- a/package.json
+++ b/package.json
@@ -45,6 +45,7 @@
 		"onCommand:frontMatter.exportTaxonomy",
 		"onCommand:frontMatter.remap",
 		"onCommand:frontMatter.setDate",
+		"onCommand:frontMatter.setLastModifiedDate",
 		"onCommand:frontMatter.generateSlug"
 	],
 	"main": "./dist/extension",
@@ -125,6 +126,10 @@
 				"command": "frontMatter.setDate",
 				"title": "Front Matter: Set current date"
 			},
+			{
+				"command": "frontMatter.setLastModifiedDate",
+				"title": "Front Matter: Set lastmod date"
+			},
 			{
 				"command": "frontMatter.generateSlug",
 				"title": "Front Matter: Generate slug based on article title"
diff --git a/src/commands/Article.ts b/src/commands/Article.ts
index b142ae48..3fa0ae88 100644
--- a/src/commands/Article.ts
+++ b/src/commands/Article.ts
@@ -9,8 +9,8 @@ export class Article {
 
   /**
   * Insert taxonomy
-  * 
-  * @param type 
+  *
+  * @param type
   */
   public static async insert(type: TaxonomyType) {
     const config = vscode.workspace.getConfiguration(CONFIG_KEY);
@@ -18,15 +18,15 @@ export class Article {
     if (!editor) {
       return;
     }
-    
+
     const article = ArticleHelper.getFrontMatter(editor);
     if (!article) {
       return;
     }
-    
+
     let options: vscode.QuickPickItem[] = [];
     const matterProp: string = type === TaxonomyType.Tag ? "tags" : "categories";
-    
+
     // Add the selected options to the options array
     if (article.data[matterProp]) {
       const propData = article.data[matterProp];
@@ -37,7 +37,7 @@ export class Article {
         } as vscode.QuickPickItem));
       }
     }
-    
+
     // Add all the known options to the selection list
     const crntOptions = SettingsHelper.getTaxonomy(type);
     if (crntOptions && crntOptions.length > 0) {
@@ -49,21 +49,21 @@ export class Article {
         }
       }
     }
-    
+
     if (options.length === 0) {
       vscode.window.showInformationMessage(`${EXTENSION_NAME}: No ${type === TaxonomyType.Tag ? "tags" : "categories"} configured.`);
       return;
     }
-    
-    const selectedOptions = await vscode.window.showQuickPick(options, { 
+
+    const selectedOptions = await vscode.window.showQuickPick(options, {
       placeHolder: `Select your ${type === TaxonomyType.Tag ? "tags" : "categories"} to insert`,
-      canPickMany: true 
+      canPickMany: true
     });
-    
+
     if (selectedOptions) {
       article.data[matterProp] = selectedOptions.map(o => o.label);
     }
-    
+
     ArticleHelper.update(editor, article);
   }
 
@@ -89,7 +89,37 @@ export class Article {
       } else {
         article.data["date"] = new Date();
       }
-      
+
+      ArticleHelper.update(editor, article);
+    } catch (e) {
+      vscode.window.showErrorMessage(`${EXTENSION_NAME}: Something failed while parsing the date format. Check your "${CONFIG_KEY}${SETTING_DATE_FORMAT}" setting.`);
+      console.log(e.message);
+    }
+  }
+
+  /**
+   * Sets the article lastmod date
+   */
+  public static async setLastModifiedDate() {
+    const config = vscode.workspace.getConfiguration(CONFIG_KEY);
+    const editor = vscode.window.activeTextEditor;
+    if (!editor) {
+      return;
+    }
+
+    const article = ArticleHelper.getFrontMatter(editor);
+    if (!article) {
+      return;
+    }
+
+    const dateFormat = config.get(SETTING_DATE_FORMAT) as string;
+    try {
+      if (dateFormat && typeof dateFormat === "string") {
+        article.data["lastmod"] = format(new Date(), dateFormat);
+      } else {
+        article.data["lastmod"] = new Date();
+      }
+
       ArticleHelper.update(editor, article);
     } catch (e) {
       vscode.window.showErrorMessage(`${EXTENSION_NAME}: Something failed while parsing the date format. Check your "${CONFIG_KEY}${SETTING_DATE_FORMAT}" setting.`);
@@ -139,4 +169,4 @@ export class Article {
     article.data["draft"] = newDraftStatus;
     ArticleHelper.update(editor, article);
   }
-}
\ No newline at end of file
+}
diff --git a/src/extension.ts b/src/extension.ts
index 33323bd8..ea841de0 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -32,11 +32,15 @@ export function activate({ subscriptions }: vscode.ExtensionContext) {
 	let remap = vscode.commands.registerCommand('frontMatter.remap', () => {
 		Settings.remap();
 	});
-	
+
 	let setDate = vscode.commands.registerCommand('frontMatter.setDate', () => {
 		Article.setDate();
 	});
 
+	let setLastModifiedDate = vscode.commands.registerCommand('frontMatter.setLastModifiedDate', () => {
+		Article.setLastModifiedDate();
+	});
+
 	let generateSlug = vscode.commands.registerCommand('frontMatter.generateSlug', () => {
 		Article.generateSlug();
 	});
@@ -66,6 +70,7 @@ export function activate({ subscriptions }: vscode.ExtensionContext) {
 	subscriptions.push(exportTaxonomy);
 	subscriptions.push(remap);
 	subscriptions.push(setDate);
+	subscriptions.push(setLastModifiedDate);
 	subscriptions.push(generateSlug);
 	subscriptions.push(toggleDraft);
 }
@@ -84,4 +89,4 @@ const debounceShowDraftTrigger = () => {
     clearTimeout(timeout);
     timeout = setTimeout(functionCall, time);
   };
-};
\ No newline at end of file
+};
diff --git a/src/helpers/SeoHelper.ts b/src/helpers/SeoHelper.ts
index cf603a0e..790171c2 100644
--- a/src/helpers/SeoHelper.ts
+++ b/src/helpers/SeoHelper.ts
@@ -18,7 +18,7 @@ export class SeoHelper {
 
         const diagnostic: vscode.Diagnostic = {
           code: '',
-          message: `Article ${fieldName} is longer than ${length} characters (current length: ${value.length}). For SEO reasons, it would be better to make it less than 60 characters.`,
+          message: `Article ${fieldName} is longer than ${length} characters (current length: ${value.length}). For SEO reasons, it would be better to make it less than ${length} characters.`,
           range: new vscode.Range(posStart, posEnd),
           severity: vscode.DiagnosticSeverity.Warning,
           source: 'Front Matter'