diff --git a/config/environments/development.js.example b/config/environments/development.js.example
index e5d69a0e..41eb4a17 100644
--- a/config/environments/development.js.example
+++ b/config/environments/development.js.example
@@ -58,6 +58,14 @@ var config = {
         */
         row_limit: 65535,
         simplify_geometries: true,
+        /*
+         * Set persist_connection to false if you want
+         * database connections to be closed on renderer
+         * expiration (1 minute after last use).
+         * Setting to true (the default) would never
+         * close any connection for the server's lifetime
+         */
+        persist_connection: false,
         max_size: 500
     }
     ,mapnik_version: undefined
diff --git a/config/environments/production.js.example b/config/environments/production.js.example
index 19ac0861..bc50d114 100644
--- a/config/environments/production.js.example
+++ b/config/environments/production.js.example
@@ -51,6 +51,14 @@ var config = {
         port: 6432,
         extent: "-20037508.3,-20037508.3,20037508.3,20037508.3",
         row_limit: 65535,
+        /*
+         * Set persist_connection to false if you want
+         * database connections to be closed on renderer
+         * expiration (1 minute after last use).
+         * Setting to true (the default) would never
+         * close any connection for the server's lifetime
+         */
+        persist_connection: false,
         simplify_geometries: true,
         max_size: 500
     }
diff --git a/config/environments/staging.js.example b/config/environments/staging.js.example
index 99e0a56f..4302c99d 100644
--- a/config/environments/staging.js.example
+++ b/config/environments/staging.js.example
@@ -52,6 +52,14 @@ var config = {
         extent: "-20037508.3,-20037508.3,20037508.3,20037508.3",
         row_limit: 65535,
         simplify_geometries: true,
+        /*
+         * Set persist_connection to false if you want
+         * database connections to be closed on renderer
+         * expiration (1 minute after last use).
+         * Setting to true (the default) would never
+         * close any connection for the server's lifetime
+         */
+        persist_connection: false,
         max_size: 500
     }
     ,mapnik_version: undefined
diff --git a/config/environments/test.js.example b/config/environments/test.js.example
index 7f700d96..8ded2588 100644
--- a/config/environments/test.js.example
+++ b/config/environments/test.js.example
@@ -52,6 +52,14 @@ var config = {
         extent: "-20037508.3,-20037508.3,20037508.3,20037508.3",
         row_limit: 65535,
         simplify_geometries: true,
+        /*
+         * Set persist_connection to false if you want
+         * database connections to be closed on renderer
+         * expiration (1 minute after last use).
+         * Setting to true (the default) would never
+         * close any connection for the server's lifetime
+         */
+        persist_connection: false,
         max_size: 500
     }
     ,mapnik_version: ''