diff --git a/.config/zsh/completion/_diffcmds b/.config/zsh/completion/_diffcmds
new file mode 100644
index 0000000..b1a1f1a
--- /dev/null
+++ b/.config/zsh/completion/_diffcmds
@@ -0,0 +1,14 @@
+#compdef diffcmds
+
+# Very much simplified version of _sudo
+
+local -a args
+
+# TODO: complete behind `--` whatever would have been completed at the position
+# of `%%`
+args+=(
+	"(-)1: :{ _command_names -e }"
+	"*:: :{ _normal }"
+)
+
+_arguments $args