diff --git a/README.md b/README.md
index b62cab9..18a60c3 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,9 @@
 # tutorials
 P4 language tutorials
+
+**Make sure that you edit [env.sh] (env.sh) to point to your local copy of
+  [bmv2] (https://github.com/p4lang/behavioral-model) and [p4c-bm]
+  (https://github.com/p4lang/p4c-bm). You may want to follow the instructions
+  [here]
+  (https://github.com/p4lang/tutorials/tree/master/SIGCOMM_2015#obtaining-required-software)
+  to make sure that your environment is setup correctly.**