diff --git a/.travis.yml b/.travis.yml
index 62ab624..effde91 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,3 +9,7 @@ node_js:
 services:
   - redis-server
   - mongodb
+
+install:
+  - npm install
+  - npm install redis mongo
diff --git a/README.md b/README.md
index 274badc..fc0a3a3 100644
--- a/README.md
+++ b/README.md
@@ -33,8 +33,10 @@ Follow [manast](http://twitter.com/manast) for news and updates regarding this l
 
 Using npm:
 
-```javascript
+```bash
 npm install acl
+# Install redis or mongo if needed
+npm install redis mongo
 ```
 
 ##Documentation
diff --git a/package.json b/package.json
index 1f11e6c..733e7e0 100644
--- a/package.json
+++ b/package.json
@@ -17,14 +17,16 @@
   "dependencies": {
     "async": "^2.1.4",
     "bluebird": "^3.0.2",
-    "lodash": "^4.17.3",
-    "mongodb": "^2.0.47",
-    "redis": "^2.2.5"
+    "lodash": "^4.17.3"
   },
   "devDependencies": {
     "mocha": "^3.2.0",
     "chai": "^3.4.0"
   },
+  "optionalDependencies": {
+    "mongodb": "^2.0.47",
+    "redis": "^2.2.5"
+  },
   "scripts": {
     "test": "mocha test/runner.js --reporter spec",
     "cover": "istanbul cover -- _mocha test/runner.js --reporter spec"