diff --git a/CHANGELOG.md b/CHANGELOG.md
index afd8475a..4b38349a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 Any changes, including backwards incompatible changes will be listed here
 
+## HEAD
+
+- Deprecated PMX configuration option. Use prom-client for monitoring
+
 ## 10.1.3 (23/3/2019)
 
 - Enable prometheus endpoint
diff --git a/config/README.md b/config/README.md
index 2f1bccd1..40a8753c 100644
--- a/config/README.md
+++ b/config/README.md
@@ -31,9 +31,6 @@ GA_KEY
 # Mapbox key if you wish to use `/explore` functionality
 MAPBOX_PUBLIC_KEY
 
-# Enable pm2/io application monitoring
-PMX
-
 #Inserts optional prometheus monitoring middleware
 # Express-prom-bundle exposes a '/metrics' endpoint which can be queried by prometheus
 # This endpoint requires basic auth defined by: