diff --git a/README b/README
index d0bf73d..2e0a069 100644
--- a/README
+++ b/README
@@ -1,2 +1,8 @@
 NDN module requires a number of patches to be applied on NS-3.
 Patches are in patches/ folder
+
+
+Depending on which base NS-3 is used, you may need to rescan python binding
+
+./waf --apiscan=ndnSIM
+