add an brief instruction what this pass is


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6676 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ModuloScheduling/README b/lib/CodeGen/ModuloScheduling/README
index 4add2a2..3206161 100644
--- a/lib/CodeGen/ModuloScheduling/README
+++ b/lib/CodeGen/ModuloScheduling/README
@@ -1,4 +1,4 @@
-The moduloScheduling pass includes two passes
+The modulo scheduling pass impliment modulo scheduling for llvm instruction. It includes two passes
 
 
 1. building graph