diff --git a/lib/Interpreter/CheckEmptyTransactionTransformer.cpp b/lib/Interpreter/CheckEmptyTransactionTransformer.cpp
index 4e2aa4e9..0ecf0478 100644
--- a/lib/Interpreter/CheckEmptyTransactionTransformer.cpp
+++ b/lib/Interpreter/CheckEmptyTransactionTransformer.cpp
@@ -37,6 +37,7 @@ namespace cling {
         }
         cling::Transaction T(m_Sema->getASTContext());
         T.append(FD);
+        // We know that it didn't end up in the EE by design.
         ASTNodeEraser eraser(m_Sema, /*ExecutionEngine*/0);
         eraser.RevertTransaction(&T);
       }