diff --git a/src/morevna.py b/src/morevna.py
--- a/src/morevna.py
+++ b/src/morevna.py
@@ -44,10 +44,10 @@ def serve(args):
 parser=ArgumentParser()
 subparsers=parser.add_subparsers()
 
-pRebuild=subparsers.add_parser("build")
-pRebuild.add_argument("treefile",help="stored hash tree location")
-pRebuild.add_argument("datafile")
-pRebuild.set_defaults(func=buildTree)
+pBuild=subparsers.add_parser("build")
+pBuild.add_argument("treefile", help="stored hash tree location")
+pBuild.add_argument("datafile")
+pBuild.set_defaults(func=buildTree)
 
 pUpdate=subparsers.add_parser("update")
 pUpdate.add_argument("-p","--port",type=int)