diff --git a/lib/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp
index 0d961c3..fd7fe90 100644
--- a/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -2333,6 +2333,9 @@
     }
   }
 
+  // FIXME: Check for unresolved forward-declared metadata references
+  // and clean up leaks.
+
   // See if anything took the address of blocks in this function.  If so,
   // resolve them now.
   DenseMap<Function*, std::vector<BlockAddrRefTy> >::iterator BAFRI =