diff --git a/Error-messages.md b/Error-messages.md
index 377ecd0..e3c1087 100644
--- a/Error-messages.md
+++ b/Error-messages.md
@@ -1,3 +1,7 @@
+### Unsupported directory structure
+* Source directory/archive have incorrect directory structure.
+* Check [[this|Automatic output splitting]] for more details.
+
 ### Failed to prepare a workspace
 * Source files or directories use too long names.
 * Third party application is blocking KCC temporary files in some way.