diff --git a/lib/Target/PowerPC/README.txt b/lib/Target/PowerPC/README.txt
index a6034e1fa9a..66726c143e7 100644
--- a/lib/Target/PowerPC/README.txt
+++ b/lib/Target/PowerPC/README.txt
@@ -3,6 +3,7 @@
 TODO:
 * gpr0 allocation
 * implement do-loop -> bdnz transform
+* Implement __builtin_trap (ISD::TRAP) as 'tw 31, 0, 0' aka 'trap'.
 
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