diff --git a/scripts/combo-layer b/scripts/combo-layer
index f3480dc..64ea9a9 100755
--- a/scripts/combo-layer
+++ b/scripts/combo-layer
@@ -230,6 +230,18 @@ def action_update(conf, args):
     action_apply_patch(conf, args)
     runcmd("rm -rf %s" % patch_dir)
 
+    # Step 7: commit the updated config file if it's being tracked
+    relpath = os.path.relpath(conf.conffile)
+    try:
+        output = runcmd("git status --porcelain %s" % relpath)
+    except:
+        # Outside the repository
+        output = None
+    if output:
+        logger.info("Committing updated configuration file")
+        if output.lstrip().startswith("M"):
+            runcmd('git commit --author="combo-layer <combo-layer@localhost>" -m "Automatic commit to update last_revision" %s' % relpath)
+
 def action_apply_patch(conf, args):
     """
         apply the generated patch list to combo repo