diff --git a/docs/markdown/cli/general.md b/docs/markdown/cli/general.md
index 748c7bc..2dca58d 100644
--- a/docs/markdown/cli/general.md
+++ b/docs/markdown/cli/general.md
@@ -2,7 +2,7 @@
 
 ## `-c, --config`
 
-Specify the config file to be used.
+Specify the config file to be used (must use .yml as an extension).
 If omitted `autorestic` will search for for a `.autorestic.yml` in the current directory and your home directory.
 
 ```bash