diff --git a/include/llvm/MC/MCStreamer.h b/include/llvm/MC/MCStreamer.h
index 0b1fe6ec012..5bf4fb1c7ea 100644
--- a/include/llvm/MC/MCStreamer.h
+++ b/include/llvm/MC/MCStreamer.h
@@ -334,6 +334,8 @@ public:
   /// @param Symbol - The symbol to emit. A given symbol should only be
   /// emitted as a label once, and symbols emitted as a label should never be
   /// used in an assignment.
+  // FIXME: These emission are non-const because we mutate the symbol to
+  // add the section we're emitting it to later.
   virtual void EmitLabel(MCSymbol *Symbol);
 
   virtual void EmitDebugLabel(MCSymbol *Symbol);