diff --git a/Error-messages.md b/Error-messages.md
index 1d472fd..e84b245 100644
--- a/Error-messages.md
+++ b/Error-messages.md
@@ -8,7 +8,7 @@
 * Third party application is blocking KCC temporary files in some way.
 
 ### Source directory is empty
-* Selected directory don't contain any image files.
+* Selected directory don't contain any image files. You cannot have individual chapters in archives.
   * You cannot use the 'directory' feature with e.g. CBR files. Add them manually by multi-selection via "Add File"
 
 ### Failed to extract images from PDF file