diff --git a/README b/README
index 52b8c27..2af80dd 100644
--- a/README
+++ b/README
@@ -2,6 +2,8 @@ THIS WILL EAT YOUR DATA AND NOT APOLOGIZE FOR TALKING WHILE CHEWING.
 Probably not but this is not a robust implementation of git so don't let it out
 on your important code.
 
+This code is released into the public domain.
+
 ////////////////////////////////////////////////////////////////
 
 	ZIT - the imitation stupid content tracker
@@ -38,6 +40,9 @@ to read relevant documentation.
 The zit code is structured similarly to git v1.0.
 https://github.com/git/git/tree/v1.0.13
 
+Also it may be helpful to reference commands.png which diagrams the
+dependencies between zit subcommands.
+
 git storytime
 ~~~~~~~~~~~~~
 
diff --git a/branch b/branch
index e437fac..e6bf360 100755
--- a/branch
+++ b/branch
@@ -1,7 +1,7 @@
 #!/bin/bash -e
 
-if [[ $# -eq 0 ]]; then
-    headref=$(symbolic-ref HEAD | sed -e 's|^refs/heads/||') # for current branch
+if [[ $# -eq 0 ]]; then # for displaying all branches
+    headref=$(symbolic-ref HEAD | sed -e 's|^refs/heads/||') # get current branch
     echo "*$headref"
     cd .zit/refs/heads
     ls | grep -vxF $headref
diff --git a/checkout-index b/checkout-index
index 1f7000a..1c2cf6b 100755
--- a/checkout-index
+++ b/checkout-index
@@ -8,7 +8,7 @@ import index
 entries = index.read_index()
 # entry.c:checkout_entry
 for filename, mode, sha1 in entries:
-    assert not filename.startswith('/')
+    assert not filename.startswith('/') # basic safety checks
     assert '..' not in filename
     subprocess.check_call(['mkdir', '-p', './' + os.path.dirname(filename)])
     # TODO git 1.0 doesn't seem to unlink deleted files
diff --git a/test b/test
index b132687..74cee24 100755
--- a/test
+++ b/test
@@ -1,4 +1,5 @@
 #!/bin/bash -ex
+# TODO make compatible with actual git, probably by accepting compatible flags
 
 header() {
     echo -e "\n\033[32m$@\033[0m"