diff --git a/docs/general/server/media/music.md b/docs/general/server/media/music.md
index 633cfd83c..df0af9848 100644
--- a/docs/general/server/media/music.md
+++ b/docs/general/server/media/music.md
@@ -92,3 +92,7 @@ Multiple backdrop images can be used to cycle through several over time. Simply
 
 * thumb
 * landscape
+
+## File Extensions
+
+Files with a ".mp4" file extension are not recognised as music. If the file does not contain a video change the extension to ".m4a", otherwise it is not found during a library scan.