diff --git a/tracker/src/p.js b/tracker/src/p.js
index 0dde6d1e83385766007a756411dfaea9731d80f6..55edddcaad90979ac60250872c2924a1e8dd7248 100644
--- a/tracker/src/p.js
+++ b/tracker/src/p.js
@@ -1,3 +1,7 @@
+// NOTE: This file is deprecated and only kept around so we don't break compatibility
+// with some early customers. This script uses a cookie but this was an old version of Plausible.
+// Current script can be found in the tracker/src/plausible.js file
+
 (function(window, plausibleHost){
   'use strict';