diff --git a/wrap/Module.cpp b/wrap/Module.cpp
index 3b783b2a0..2148c177e 100644
--- a/wrap/Module.cpp
+++ b/wrap/Module.cpp
@@ -259,6 +259,7 @@ void Module::parseMarkup(const std::string& data) {
  
   Rule methodName_p = lexeme_d[(upper_p | lower_p)  >> *(alnum_p | '_')];
  
+  // gtsam::Values retract(const gtsam::VectorValues& delta) const;
   Rule method_p =  
     (returnType_p >> methodName_p[assign_a(methodName)] >> 
      '(' >> argumentList_p >> ')' >>