diff --git a/llvm/examples/Kaleidoscope/Chapter9/toy.cpp b/llvm/examples/Kaleidoscope/Chapter9/toy.cpp
--- a/llvm/examples/Kaleidoscope/Chapter9/toy.cpp
+++ b/llvm/examples/Kaleidoscope/Chapter9/toy.cpp
@@ -799,7 +799,7 @@
 static std::unique_ptr<FunctionAST> ParseTopLevelExpr() {
   SourceLocation FnLoc = CurLoc;
   if (auto E = ParseExpression()) {
-    // Make an anonymous proto.
+    // Make the top-level expression be our "main" function.
     auto Proto = std::make_unique<PrototypeAST>(FnLoc, "main",
                                                  std::vector<std::string>());
     return std::make_unique<FunctionAST>(std::move(Proto), std::move(E));