diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 324b6e3..ed207e6 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -281,6 +281,7 @@
 
 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
+  Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
 }
 
 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,