diff --git a/include/llvm/Transforms/Scalar.h b/include/llvm/Transforms/Scalar.h
index 144db236709..ba8b90ca47d 100644
--- a/include/llvm/Transforms/Scalar.h
+++ b/include/llvm/Transforms/Scalar.h
@@ -110,6 +110,16 @@ Pass *createInstructionCombiningPass();
 Pass *createPromoteMemoryToRegister();
 
 
+//===----------------------------------------------------------------------===//
+//
+// This pass reassociates commutative expressions in an order that is designed
+// to promote better constant propogation, GCSE, LICM, PRE...
+//
+// For example:  4 + (x + 5)  ->  x + (4 + 5)
+//
+Pass *createReassociatePass();
+
+
 //===----------------------------------------------------------------------===//
 //
 // These functions removes symbols from functions and modules.