diff --git a/llvm/include/llvm/Support/Threading.h b/llvm/include/llvm/Support/Threading.h
index 7e8758407c7c..3cca1d6a9913 100644
--- a/llvm/include/llvm/Support/Threading.h
+++ b/llvm/include/llvm/Support/Threading.h
@@ -21,7 +21,8 @@ namespace llvm {
   bool llvm_is_multithreaded();
 
   /// llvm_execute_on_thread - Execute the given \p UserFn on a separate
-  /// thread, passing it the provided \p UserData.
+  /// thread, passing it the provided \p UserData and waits for thread 
+  /// completion.
   ///
   /// This function does not guarantee that the code will actually be executed
   /// on a separate thread or honoring the requested stack size, but tries to do