diff --git a/UserGuide.md b/UserGuide.md
index 5795f0c..912ea15 100644
--- a/UserGuide.md
+++ b/UserGuide.md
@@ -41,6 +41,7 @@ Therefore, if some functions are not yet / not implemented, feel free to manage
  * [Tap] "<" or ">" or "^" or "v" to navigate through the map
  * [Tap] "+" or "-" to zoom (in) or (out)
  * Node location colors: Gray:   Green:
+ * Note: Map tile files should be organized in folder names by zoom level (6, 10, etc) and all placed in a 'tiles' folder in root of SD card
 
 ## Mgmt
  * [Tap] on Mgmt tab to bring up Mgmt Menu Page then [Tap] on Button