diff --git a/lib/Target/PowerPC/PowerPCReg.td b/lib/Target/PowerPC/PowerPCReg.td
index 8f856217d44..7975b0b8591 100644
--- a/lib/Target/PowerPC/PowerPCReg.td
+++ b/lib/Target/PowerPC/PowerPCReg.td
@@ -7,6 +7,7 @@
 // 
 //===----------------------------------------------------------------------===//
 //
+// This file defines the PowerPC register file in Tablegen format.
 //
 //===----------------------------------------------------------------------===//