make branch prefixes configurable
diff --git a/git-flow-support b/git-flow-support
index c48e357..55f595e 100644
--- a/git-flow-support
+++ b/git-flow-support
@@ -24,7 +24,8 @@
 		usage
 		exit 1
 	fi
-	BRANCH=support/$VERSION
+	PREFIX=$(git config --get gitflow.prefix.support || echo support/)
+	BRANCH=$PREFIX$VERSION
 }
 
 cmd_help() {