diff --git a/Installation.md b/Installation.md
index c401aa9..89323cf 100644
--- a/Installation.md
+++ b/Installation.md
@@ -1,6 +1,6 @@
 ## 7-Zip
 
-This is an optional requirement as of KCC 6.1.0. You only need to install it if 1) are using Windows 10 (2017) or earlier, 2) need to use an older KCC version, or 3) you are using metadata editor.
+This is an optional requirement as of KCC 6.1.0. You only need to install it if 1) are using Windows 10 (2017) or earlier, 2) need to use an older KCC version, 3) you are using metadata editor, or 4) you are using particular problematic files, usually rar or cbr.
 
 ### Windows 7-Zip