diff --git a/docs/installation.md b/docs/installation.md
index 13e685c..ec6bbfc 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -148,7 +148,7 @@ $ ./dotdrop.sh --cfg <my-config-file> files
 Beside the Python dependencies defined in [requirements.txt](https://github.com/deadc0de6/dotdrop/blob/master/requirements.txt),
 dotdrop depends on the following tools:
 
-* `diff`
+* `diff` (unless a different tool is used, see [diff_command](config-format.md#config-entry))
 * `git` (only if using the entry point script [dotdrop.sh](https://github.com/deadc0de6/dotdrop/blob/master/dotdrop.sh))
 * `readlink` or `realpath` (only if using the entry point script [dotdrop.sh](https://github.com/deadc0de6/dotdrop/blob/master/dotdrop.sh))