diff --git a/llvm/tools/llvm-reduce/DeltaManager.cpp b/llvm/tools/llvm-reduce/DeltaManager.cpp
--- a/llvm/tools/llvm-reduce/DeltaManager.cpp
+++ b/llvm/tools/llvm-reduce/DeltaManager.cpp
@@ -104,7 +104,7 @@
 }
 
 // FIXME: We may want to find a better metric than file size for
-// detecting reducer non-progress
+// determining when the reducer has stopped making useful progress
 static int getIRSize(TestRunner &Tester) {
   std::string Str;
   raw_string_ostream SS(Str);