diff --git a/README.md b/README.md
index daca891..ef37c54 100644
--- a/README.md
+++ b/README.md
@@ -22,4 +22,4 @@ go build ./cmd/dot
 
 - [ ] Support compare directory
 - [ ] Switch to use lua for neovim config
-- [ ] Add diff command
+- [x] Add diff command
diff --git a/internal/cli/app.go b/internal/cli/app.go
index 1811c2a..90c9dab 100644
--- a/internal/cli/app.go
+++ b/internal/cli/app.go
@@ -41,7 +41,7 @@ var (
 	installAliases = []string{"i"}
 	updateAliases  = []string{"u"}
 	cleanAliases   = []string{"c"}
-	compareAliases = []string{"cmp"}
+	compareAliases = []string{"cmp", "diff"}
 )
 
 // denyOSes contains OS which is not supported