diff --git a/src/V3Force.cpp b/src/V3Force.cpp
index c04d646dd..dec8fd112 100644
--- a/src/V3Force.cpp
+++ b/src/V3Force.cpp
@@ -206,6 +206,7 @@ public:
         }
         static AstNodeExpr* wrapIntoExprp(AstVarRef* const refp, AstNodeExpr* const exprp,
                                           AstVarRef* const varRefToReplacep) {
+            // Return a copy of exprp in which varRefToReplacep is replaced with refp
             if (exprp == varRefToReplacep) {
                 return refp;
             } else {