diff --git a/.config/linux/system/module/common/bash/module/Git.sh b/.config/linux/system/module/common/bash/module/Git.sh
index 8d993cc..3e4ffb9 100644
--- a/.config/linux/system/module/common/bash/module/Git.sh
+++ b/.config/linux/system/module/common/bash/module/Git.sh
@@ -165,10 +165,12 @@ function gg() {
 	git clone https://git.voronind.com/voronind/"${repo}"
 }
 
-# See diff for a specific commit.
-# Usage: gdc <COMMITHASH>
+# See diff for a specific commit. Last commit by default.
+# Usage: gdc [COMMITHASH]
 function gdc() {
-	git diff "${1}^!"
+	local hash="${1}"
+	[[ "${hash}" = "" ]] && hash="HEAD~"
+	git diff "${hash}^!"
 }
 
 # Get version number based on commit count.