diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index afb268d2e45..23503517c07 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -166,3 +166,9 @@ v4sf example(float *P) {
 
 //===---------------------------------------------------------------------===//
 
+We should constant fold packed type casts at the LLVM level, regardless of the
+cast.  Currently we cannot fold some casts because we don't have TargetData
+information in the constant folder, so we don't know the endianness of the 
+target!
+
+//===---------------------------------------------------------------------===//