git-branch-list: Update usage to include optional `<branch-name>`

The `save` and `drop` commands both take an optional branch name to
operate on.

1 files changed, 2 insertions, 2 deletions

diff --git a/git-branch-list b/git-branch-list
index 6e4078a..10713df 100755
--- a/git-branch-list
+++ b/git-branch-list
@@ -29,8 +29,8 @@ function initialise_database () {
 function print_usage () {
 	cat 1>&2 <<__EOF__
 usage: git branch-list
-   or: git branch-list save
-   or: git branch-list drop
+   or: git branch-list save [<branch-name>]
+   or: git branch-list drop [<branch-name>]
    or: git branch-list ID
 __EOF__
 }