diff --git a/tools/llvm-uselistorder/llvm-uselistorder.cpp b/tools/llvm-uselistorder/llvm-uselistorder.cpp
index b05416152e2..0f817d2bf38 100644
--- a/tools/llvm-uselistorder/llvm-uselistorder.cpp
+++ b/tools/llvm-uselistorder/llvm-uselistorder.cpp
@@ -7,7 +7,9 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// Verify that use-list order can be serialized correctly.
+// Verify that use-list order can be serialized correctly.  After reading the
+// provided IR, this tool shuffles the use-lists and then writes and reads to a
+// separate Module whose use-list orders are compared to the original.
 //
 //===----------------------------------------------------------------------===//