diff --git a/clang/include/clang/Frontend/CompilerInstance.h b/clang/include/clang/Frontend/CompilerInstance.h
--- a/clang/include/clang/Frontend/CompilerInstance.h
+++ b/clang/include/clang/Frontend/CompilerInstance.h
@@ -515,7 +515,7 @@
   /// {
 
   IntrusiveRefCntPtr<ASTReader> getASTReader() const;
-  void setModuleManager(IntrusiveRefCntPtr<ASTReader> Reader);
+  void setASTReader(IntrusiveRefCntPtr<ASTReader> Reader);
 
   std::shared_ptr<ModuleDependencyCollector> getModuleDepCollector() const;
   void setModuleDepCollector(
@@ -781,7 +781,6 @@
     return std::move(OutputStream);
   }
 
-  // Create module manager.
   void createASTReader();
 
   bool loadModuleFile(StringRef FileName);
diff --git a/clang/lib/Frontend/ChainedIncludesSource.cpp b/clang/lib/Frontend/ChainedIncludesSource.cpp
--- a/clang/lib/Frontend/ChainedIncludesSource.cpp
+++ b/clang/lib/Frontend/ChainedIncludesSource.cpp
@@ -189,7 +189,7 @@
           Clang->getASTConsumer().GetASTDeserializationListener());
       if (!Reader)
         return nullptr;
-      Clang->setModuleManager(Reader);
+      Clang->setASTReader(Reader);
       Clang->getASTContext().setExternalSource(Reader);
     }
 
diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -138,7 +138,7 @@
 IntrusiveRefCntPtr<ASTReader> CompilerInstance::getASTReader() const {
   return TheASTReader;
 }
-void CompilerInstance::setModuleManager(IntrusiveRefCntPtr<ASTReader> Reader) {
+void CompilerInstance::setASTReader(IntrusiveRefCntPtr<ASTReader> Reader) {
   assert(ModuleCache.get() == &Reader->getModuleManager().getModuleCache() &&
          "Expected ASTReader to use the same PCM cache");
   TheASTReader = std::move(Reader);
@@ -379,7 +379,7 @@
 void CompilerInstance::createPreprocessor(TranslationUnitKind TUKind) {
   const PreprocessorOptions &PPOpts = getPreprocessorOpts();
 
-  // The module manager holds a reference to the old preprocessor (if any).
+  // The AST reader holds a reference to the old preprocessor (if any).
   TheASTReader.reset();
 
   // Create the Preprocessor.
diff --git a/clang/lib/Frontend/FrontendAction.cpp b/clang/lib/Frontend/FrontendAction.cpp
--- a/clang/lib/Frontend/FrontendAction.cpp
+++ b/clang/lib/Frontend/FrontendAction.cpp
@@ -840,7 +840,7 @@
       source = createChainedIncludesSource(CI, FinalReader);
       if (!source)
         goto failure;
-      CI.setModuleManager(static_cast<ASTReader *>(FinalReader.get()));
+      CI.setASTReader(static_cast<ASTReader *>(FinalReader.get()));
       CI.getASTContext().setExternalSource(source);
     } else if (CI.getLangOpts().Modules ||
                !CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
@@ -870,7 +870,7 @@
         if (!CI.getASTContext().getExternalSource())
           goto failure;
       }
-      // If modules are enabled, create the module manager before creating
+      // If modules are enabled, create the AST reader before creating
       // any builtins, so that all declarations know that they might be
       // extended by an external source.
       if (CI.getLangOpts().Modules || !CI.hasASTContext() ||