diff --git a/CHANGELOG.md b/CHANGELOG.md
index d96d959..36ced52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Bowser Changelog
 
+### 1.5.0 (October 31, 2016)
+- [ADD] Throw an error when `minVersion` map has not a string as a version and fix readme (#165)
+- [FIX] Fix truly detection of Windows Phones (#167) 
+
 ### 1.4.6 (September 19, 2016)
 - [FIX] Fix mobile Opera's version detection on Android
 - [FIX] Fix typescript typings — add `mobile` and `tablet` flags
diff --git a/README.md b/README.md
index c35ac70..6492df3 100644
--- a/README.md
+++ b/README.md
@@ -41,12 +41,12 @@ bowser.check({msie: "9.0"}); // false
 /**
  * specific user agent
  */ 
-bowser.check({chrome: 45}, window.navigator.userAgent); // true
+bowser.check({chrome: "45"}, window.navigator.userAgent); // true
 
 /**
  * but false in strict mode
  */
-bowser.check({chrome: 45}, true, window.navigator.userAgent); // false
+bowser.check({chrome: "45"}, true, window.navigator.userAgent); // false
 ```
 
 ### bowser.compareVersions(versions`:Array<String>`)`:Number`
diff --git a/package.json b/package.json
index dead1b9..e80b312 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "sniff",
     "detection"
   ],
-  "version": "1.4.6",
+  "version": "1.5.0",
   "homepage": "https://github.com/ded/bowser",
   "author": "Dustin Diaz <dustin@dustindiaz.com> (http://dustindiaz.com)",
   "main": "./src/bowser.js",
diff --git a/src/bowser.js b/src/bowser.js
index d69268f..5afbc6a 100644
--- a/src/bowser.js
+++ b/src/bowser.js
@@ -321,9 +321,9 @@
     }
 
     // set OS flags for platforms that have multiple browsers
-    if (!result.msedge && (android || result.silk)) {
+    if (!result.windowsphone && !result.msedge && (android || result.silk)) {
       result.android = t
-    } else if (iosdevice) {
+    } else if (!result.windowsphone && !result.msedge && iosdevice) {
       result[iosdevice] = t
       result.ios = t
     } else if (mac) {
@@ -540,6 +540,10 @@
     for (var browser in minVersions) {
       if (minVersions.hasOwnProperty(browser)) {
         if (_bowser[browser]) {
+          if (typeof minVersions[browser] !== 'string') {
+            throw new Error('Browser version in the minVersion map should be a string: ' + browser + ': ' + String(minVersions));
+          }
+
           // browser version and min supported version.
           return compareVersions([version, minVersions[browser]]) < 0;
         }
diff --git a/src/useragents.js b/src/useragents.js
index e30aea3..4d2640d 100644
--- a/src/useragents.js
+++ b/src/useragents.js
@@ -936,6 +936,15 @@ module.exports.useragents = {
       , mobile: true
       , a: true
       }
+    , 'Mozilla/5.0 (Mobile; Windows Phone 8.1; Android 4.0; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; Microsoft; Lumia 640 LTE) like iPhone OS 7_0_3 Mac OS X AppleWebKit/537 (KHTML, like Gecko) Mobile Safari/537': {
+        windowsphone: true
+      , webkit: true
+      , osversion: '8.1'
+      , msie: true
+      , version: '11.0'
+      , mobile: true
+      , a: true
+      }
     }
   , WebOS: {
       'Mozilla/5.0 (hp-tablet; Linux; hpwOS/3.0.5; U; en-US) AppleWebKit/534.6 (KHTML, like Gecko) wOSBrowser/234.83 Safari/534.6 TouchPad/1.0': {
diff --git a/test/test.js b/test/test.js
index 78d739b..eba2b2d 100644
--- a/test/test.js
+++ b/test/test.js
@@ -127,6 +127,12 @@ describe('Unsupported browser check', function() {
     assert.equal(supported, false);
   });
 
+  it('should throw an error when minVersion map has a number, but not a string', function() {
+    assert.throws(() => {
+      browser.check({msie: 11}, this.ie10_6);
+    }, /Browser version in the minVersion map should be a string/);
+  });
+
   it('should be passed by #check for IE10.6 when version was not specified', function() {
     var supported = browser.check({}, this.ie10_6);
     assert.equal(supported, true);