diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 2d4925d307a..8929ac4f2a6 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -2370,3 +2370,8 @@ unsigned foo(unsigned x, unsigned y) { return x > y && x != 0; }
 should fold to x > y.
 
 //===---------------------------------------------------------------------===//
+
+int f(double x) { return __builtin_fabs(x) < 0.0; }
+should fold to false.
+
+//===---------------------------------------------------------------------===//