diff --git a/README.md b/README.md
index 6c78cd8..d045229 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,8 @@ The following fields are provided in the migration:
     t.string   "controller_name"      # logs the controller name
     t.string   "action_name"          # logs the action_name
     t.string   "view_name"            # TODO: log individual views (as well as partials and nested partials)
-    t.string   "request_hash"         # unique ID per request, in case you want to log multiple impressions and associate them together
+    t.string   "request_hash"         # unique ID per request, in case you want to log multiple impressions and group them
+    t.string   "session_hash"         # logs the rails session
     t.string   "ip_address"           # request.remote_ip
     t.string   "message"              # custom message you can add
     t.datetime "created_at"           # I am not sure what this is.... Any clue?