diff --git a/fish/.config/fish/functions/gdd.fish b/fish/.config/fish/functions/gdd.fish
new file mode 100644
index 0000000..b1ecf7c
--- /dev/null
+++ b/fish/.config/fish/functions/gdd.fish
@@ -0,0 +1,4 @@
+function gdd --description "Use difftastic as a difftool"
+  git difftool --tool=difftastic $argv
+end
+