Changed to as it's more accurate

README.md

@@ -165,14 +165,14 @@ Responsible for loading the values parsed from `process.env` into the configurat
   //
   nconf.env('__');
   // Get the value of the env variable 'database__host'
-  var dbHost = nconf.get('database:host'); 
+  var dbHost = nconf.get('database:host');
 
   //
   // Or use both options
   //
   nconf.env({
     separator: '__',
-    filter: ['database__host', 'only', 'load', 'these', 'values']
+    whitelist: ['database__host', 'only', 'load', 'these', 'values']
   });
   var dbHost = nconf.get('database:host');
 ```

lib/nconf/stores/env.js

@@ -21,10 +21,10 @@ var Env = exports.Env = function (options) {
   options        = options || {};
   this.type      = 'env';
   this.readOnly  = true;
-  this.filter    = options.filter || [];
+  this.whitelist    = options.whitelist || [];
   this.separator = options.separator || '';
   if (options instanceof Array) {
-    this.filter = options;
+    this.whitelist = options;
   }
   if (typeof(options) === 'string') {
     this.separator = options;
@@ -52,7 +52,7 @@ Env.prototype.loadEnv = function () {
 
   this.readOnly = false;
   Object.keys(process.env).filter(function (key) {
-    return !self.filter.length || self.filter.indexOf(key) !== -1;
+    return !self.whitelist.length || self.whitelist.indexOf(key) !== -1;
   }).forEach(function (key) {
     if (self.separator) {
       self.set(common.key.apply(common, key.split(self.separator)), process.env[key]);

test/stores/env-test.js

@@ -16,8 +16,8 @@ vows.describe('nconf/stores/env').addBatch({
     "should have the correct methods defined": function (env) {
       assert.isFunction(env.loadSync);
       assert.isFunction(env.loadEnv);
-      assert.isArray(env.filter);
-      assert.lengthOf(env.filter, 0);
+      assert.isArray(env.whitelist);
+      assert.lengthOf(env.whitelist, 0);
       assert.equal(env.separator, '');
     }
   }