diff --git a/lib/AST/ASTImporter.cpp b/lib/AST/ASTImporter.cpp
index 9f5719f..f5e392f 100644
--- a/lib/AST/ASTImporter.cpp
+++ b/lib/AST/ASTImporter.cpp
@@ -4246,8 +4246,8 @@
   SourceManager &FromSM = FromContext.getSourceManager();
   
   // For now, map everything down to its spelling location, so that we
-  // don't have to import macro instantiations.
-  // FIXME: Import macro instantiations!
+  // don't have to import macro expansions.
+  // FIXME: Import macro expansions!
   FromLoc = FromSM.getSpellingLoc(FromLoc);
   std::pair<FileID, unsigned> Decomposed = FromSM.getDecomposedLoc(FromLoc);
   SourceManager &ToSM = ToContext.getSourceManager();
@@ -4268,7 +4268,7 @@
   SourceManager &FromSM = FromContext.getSourceManager();
   SourceManager &ToSM = ToContext.getSourceManager();
   const SrcMgr::SLocEntry &FromSLoc = FromSM.getSLocEntry(FromID);
-  assert(FromSLoc.isFile() && "Cannot handle macro instantiations yet");
+  assert(FromSLoc.isFile() && "Cannot handle macro expansions yet");
   
   // Include location of this file.
   SourceLocation ToIncludeLoc = Import(FromSLoc.getFile().getIncludeLoc());