Make "tree_entry" have a SHA1 instead of a union of object pointers

diff --git a/Documentation/git-checkout.txt b/Documentation/git-checkout.txt
index 095128906a523cc8ca30639c1d42452a4bcb0050..d82efc00d403dc13ac1e85c53083ccc52a4c79f3 100644 (file)
--- a/Documentation/git-checkout.txt
+++ b/Documentation/git-checkout.txt
@@ -35,7 +35,10 @@ OPTIONS
        Force a re-read of everything.
 
 -b::
-       Create a new branch and start it at <branch>.
+       Create a new branch named <new_branch> and start it at
+       <branch>.  The new branch name must pass all checks defined
+       by gitlink:git-check-ref-format[1].  Some of these checks
+       may restrict the characters allowed in a branch name.
 
 -m::
        If you have local modifications to one or more files that