diff --git a/src/commands/Article.ts b/src/commands/Article.ts
index b169b87d..86ce503c 100644
--- a/src/commands/Article.ts
+++ b/src/commands/Article.ts
@@ -203,7 +203,7 @@ export class Article {
 
     const file = parseWinPath(editor.document.fileName);
 
-    if (!file.endsWith(`.md`) && !file.endsWith(`.mdx`)) {
+    if (!file.endsWith(`.md`) && !file.endsWith(`.markdown`) && !file.endsWith(`.mdx`)) {
       return;
     }
 
diff --git a/src/commands/Dashboard.ts b/src/commands/Dashboard.ts
index a765d3d7..0a458346 100644
--- a/src/commands/Dashboard.ts
+++ b/src/commands/Dashboard.ts
@@ -548,7 +548,7 @@ export class Dashboard {
     if (folderInfo) {
       for (const folder of folderInfo) {
         for (const file of folder.lastModified) {
-          if (file.fileName.endsWith(`.md`) || file.fileName.endsWith(`.mdx`)) {
+          if (file.fileName.endsWith(`.md`) || file.fileName.endsWith(`.markdown`) || file.fileName.endsWith(`.mdx`)) {
             try {
               const article = ArticleHelper.getFrontMatterByPath(file.filePath);
 
diff --git a/src/commands/Diagnostics.ts b/src/commands/Diagnostics.ts
index 9e5c8e77..69093109 100644
--- a/src/commands/Diagnostics.ts
+++ b/src/commands/Diagnostics.ts
@@ -56,7 +56,8 @@ ${folderData.join("\n")}
 
     const mdFiles = await workspace.findFiles(join(projectStart, folder.excludeSubdir ? '/' : '**/', '*.md'));
     const mdxFiles = await workspace.findFiles(join(projectStart, folder.excludeSubdir ? '/' : '**/', '*.mdx'));
+    const markdownFiles = await workspace.findFiles(join(projectStart, folder.excludeSubdir ? '/' : '**/', '*.markdown'));
 
-    return `- Project start length: ${projectStart.length} | Search in: "${join(projectStart, folder.excludeSubdir ? '/' : '**/', '*.*')}" | mdFiles: ${mdFiles.length} | mdxFiles: ${mdxFiles.length}`;
+    return `- Project start length: ${projectStart.length} | Search in: "${join(projectStart, folder.excludeSubdir ? '/' : '**/', '*.*')}" | mdFiles: ${mdFiles.length} | mdxFiles: ${mdxFiles.length} | markdownFiles: ${markdownFiles.length}`;
   }
 }
\ No newline at end of file
diff --git a/src/commands/Folders.ts b/src/commands/Folders.ts
index 480ba5d1..1b0c45ce 100644
--- a/src/commands/Folders.ts
+++ b/src/commands/Folders.ts
@@ -212,8 +212,9 @@ export class Folders {
             projectStart = projectStart.replace(/\\/g, '/');
             projectStart = projectStart.startsWith('/') ? projectStart.substr(1) : projectStart;
             const mdFiles = await workspace.findFiles(join(projectStart, folder.excludeSubdir ? '/' : '**/', '*.md'));
+            const markdownFiles = await workspace.findFiles(join(projectStart, folder.excludeSubdir ? '/' : '**/', '*.markdown'));
             const mdxFiles = await workspace.findFiles(join(projectStart, folder.excludeSubdir ? '/' : '**/', '*.mdx'));
-            let files = [...mdFiles, ...mdxFiles];
+            let files = [...mdFiles, ...markdownFiles, ...mdxFiles];
             if (files) {
               let fileStats: FileInfo[] = [];
 
diff --git a/src/panelWebView/components/FileItem.tsx b/src/panelWebView/components/FileItem.tsx
index 1d2db400..e4c84613 100644
--- a/src/panelWebView/components/FileItem.tsx
+++ b/src/panelWebView/components/FileItem.tsx
@@ -19,7 +19,7 @@ const FileItem: React.FunctionComponent<IFileItemProps> = ({ name, path }: React
     <li className={`file_list__items__item`}
         onClick={openFile}>
       {
-        (name.endsWith('.md') || name.endsWith('.mdx')) ? (
+        (name.endsWith('.md') || name.endsWith('.markdown') || name.endsWith('.mdx')) ? (
           <MarkdownIcon />
         ) : (
           <FileIcon />