diff --git a/llvm/include/llvm/IR/Module.h b/llvm/include/llvm/IR/Module.h
index 7ad48a17064b..f1f5ec36ade7 100644
--- a/llvm/include/llvm/IR/Module.h
+++ b/llvm/include/llvm/IR/Module.h
@@ -219,6 +219,7 @@ private:
   Materializer;                   ///< Used to materialize GlobalValues
   std::string ModuleID;           ///< Human readable identifier for the module
   std::string TargetTriple;       ///< Platform target triple Module compiled on
+                                  ///< Format:<arch><sub>-<vendor>-<sys>-<abi>
   void *NamedMDSymTab;            ///< NamedMDNode names.
   // Allow lazy initialization in const method.
   mutable RandomNumberGenerator *RNG; ///< The random number generator for this module.