Document all available flags in all of the subcommand synopsis texts.
diff --git a/git-flow-support b/git-flow-support
index f3e2eb3..9403c12 100644
--- a/git-flow-support
+++ b/git-flow-support
@@ -23,7 +23,7 @@
 
 usage() {
 	echo "usage: git flow support [list] [-v]"
-	echo "       git flow support start <version> <base>"
+	echo "       git flow support start [-F] <version> <base>"
 }
 
 cmd_default() {