diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 5febad6..532767b 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -8029,6 +8029,7 @@
   } else if (S->isFunctionPrototypeScope()) {
     // If this is an enum declaration in function prototype scope, set its
     // initial context to the translation unit.
+    // FIXME: [citation needed]
     SearchDC = Context.getTranslationUnitDecl();
   }