diff --git a/commit-tree b/commit-tree
new file mode 100755
index 0000000..b102b4b
--- /dev/null
+++ b/commit-tree
@@ -0,0 +1,14 @@
+#!/bin/bash -e
+
+echo tree $1 > .zit/commit.tmp
+shift
+while [[ $1 == -p ]]; do
+    echo parent $2 >> .zit/commit.tmp
+    shift; shift
+done
+echo author "Joe Mou <joe@mou.fo> $(date +'%s %z')" >> .zit/commit.tmp
+echo committer "Joe Mou <joe@mou.fo> $(date +'%s %z')" >> .zit/commit.tmp
+echo >> .zit/commit.tmp
+cat >> .zit/commit.tmp
+
+./hash-object commit .zit/commit.tmp