diff --git a/assets/js/helpers/contains.js b/assets/js/helpers/contains.js
index 760faa5..cd9c53f 100644
--- a/assets/js/helpers/contains.js
+++ b/assets/js/helpers/contains.js
@@ -1,12 +1,12 @@
 /**
  * Creates an array from list using \n as delimiter
- * and checks if the str is located in the list.
+ * and checks if any element in list is contained in the url.
  *
- * @param str
+ * @param url
  * @param list
  * @returns {boolean}
  */
-function contains(str, list) {
+function contains(url, list) {
     var lines = list.split('\n');
 
     for (var i = 0; i < lines.length; i ++) {
@@ -17,8 +17,8 @@ function contains(str, list) {
         // If by any chance one line in the list is empty, ignore it
         if(cleanLine === '') continue;
 
-        // If current line contains the str return true
-        if (cleanLine.indexOf(str) > -1) {
+        // If url contains the current line return true
+        if (url.indexOf(cleanLine) > -1) {
             return true;
         }
     }
diff --git a/tests/helpers/contains.spec.js b/tests/helpers/contains.spec.js
index 307fc86..40994eb 100644
--- a/tests/helpers/contains.spec.js
+++ b/tests/helpers/contains.spec.js
@@ -8,17 +8,19 @@ describe('contains', function() {
         expect(contains).to.be.a('function');
     });
 
-    it('should find the line and return true', function() {
+    it('should match url against blacklist and return true', function() {
 
-        var list = ".app\ntest.com";
+        var list = "localhost\ntest.com";
 
-        expect(contains('.app', list)).to.equal(true);
+        var url = 'http://localhost/fooapp';
+        expect(contains(url, list)).to.equal(true);
     });
 
-    it('should not find the line and it should return false', function() {
+    it('should not match url against blacklist and return false', function() {
 
-        var list = ".app\ntest.com";
+        var list = "localhost\ntest.com";
 
-        expect(contains('.app2', list)).to.equal(false);
+        var url = 'http://localhost/fooapp';
+        expect(contains('http://localhost2/fooapp', list)).to.equal(false);
     });
-});
\ No newline at end of file
+});