diff --git a/lib/Rewrite/HTMLRewrite.cpp b/lib/Rewrite/HTMLRewrite.cpp
index 63b7def..6a1e3dc 100644
--- a/lib/Rewrite/HTMLRewrite.cpp
+++ b/lib/Rewrite/HTMLRewrite.cpp
@@ -409,6 +409,7 @@
       --TokLen;
       // FALL THROUGH.
     case tok::string_literal:
+      // FIXME: Exclude the optional ud-suffix from the highlighted range.
       HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
                      "<span class='string_literal'>", "</span>");
       break;