diff --git a/package.json b/package.json
index 64e9130..f700cad 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
   },
   "dependencies": {
     "underscore": "~1.3.3",
-    "mapnik-reference": "~5.0.0",
+    "mapnik-reference": "git://github.com/CartoDB/mapnik-reference.git#cdb-5.0",
     "xml2js": "~0.1.13"
   },
   "devDependencies": {
diff --git a/package.json.README b/package.json.README
new file mode 100644
index 0000000..60a3b77
--- /dev/null
+++ b/package.json.README
@@ -0,0 +1,11 @@
+Since we can't put comments in the package.json file
+this file fills that gap.
+
+Dependencies needing comments:
+
+ "mapnik-reference"
+
+ We use our own fork because we need advertisement of "marker-multi-policy"
+ which is only in the reference of mapnik-2.1.1. Can be reverted to upstream
+ once this pull request is released:
+ https://github.com/mapnik/mapnik-reference/pull/41