--- a/sandbox/jlf/samples/benchmark/call-benchmark.notes.txt
+++ b/sandbox/jlf/samples/benchmark/call-benchmark.notes.txt
@@ -11,6 +11,11 @@
 - the return instruction in the procedure / routine / method (identical in the 4 test cases)
 - the sequence of calls to analyze : why a routine call is so slow compared to a method call ?
 - the rest of the call stack (identical in the 4 test cases)
+
+[later]
+why a routine call is so slow compared to a method call ?
+--> problem identified and fixed : it's because of the environment variable 'RXTRACE' which is read at each call of routine.
+
 
 internal call