make branch prefixes configurable
diff --git a/git-flow-release b/git-flow-release
index ca5e360..d42287d 100755
--- a/git-flow-release
+++ b/git-flow-release
@@ -35,7 +35,8 @@
 		usage
 		exit 1
 	fi
-	BRANCH=release/$VERSION
+	PREFIX=$(git config --get gitflow.prefix.release || echo release/)
+	BRANCH=$PREFIX$VERSION
 }
 
 cmd_help() {