diff --git a/Publishing-your-cog.md b/Publishing-your-cog.md
index 631441b..f639337 100644
--- a/Publishing-your-cog.md
+++ b/Publishing-your-cog.md
@@ -12,6 +12,7 @@ Once you're sure that your cog meets the requirements, this is how you proceed:
 * Any data that your cog needs must be in a folder called "data" inside that folder
 * If your cog doesn't need additional files in order to work, don't make a data subfolder
 * No multiple *.py files in the root folder  
+* No subfolders inside data folder
 
 Example:  
 testcog/testcog.py