diff --git a/Error-messages.md b/Error-messages.md
index e84b245..74968fc 100644
--- a/Error-messages.md
+++ b/Error-messages.md
@@ -3,6 +3,9 @@
 * The most common issue is having a cover image and individual chapter folders on the same level. Move the cover image into the first chapter's folder, renaming as necessary to ensure it is first in the file order.
 * Check [[this|Automatic output splitting]] for more details.
 
+### Extraction failed. 
+* Install specialized extraction software: https://github.com/ciromattia/kcc/wiki/Installation#7-zip
+
 ### Failed to prepare a workspace
 * Source files or directories use too long names.
 * Third party application is blocking KCC temporary files in some way.