diff --git a/doc/CREATING_THEMES.md b/doc/CREATING_THEMES.md
index 5fa6183..c99e5c1 100644
--- a/doc/CREATING_THEMES.md
+++ b/doc/CREATING_THEMES.md
@@ -8,6 +8,8 @@ How to create your own theme
 For example: If you've only modified the main.css, create a folder named "css" in your theme folder, and put your main.css in there.
 The theme engine will load your css, and falls back to files in the default theme that aren't in your theme folder.
 
+Note: Image files need to reside in the /images folder and it can't contain sub-directories.
+
 Examples:
 
 * gabdark - a theme with only a modified main.css