diff --git a/README.md b/README.md
index 6cbbc7e6..4799fdf4 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ A [shadowsocks](http://shadowsocks.org) client for Android, written in Scala.
 * Invoke the building like this
 
 ```bash
-    git submodule update --init
+    git submodule update --init --recursive
 
     # Build the App
     sbt clean android:package-release
@@ -53,6 +53,7 @@ Translators can go to [POEditor](https://poeditor.com/join/project/u5VHO9vhSf) t
     <li>pdnsd: <a href="https://github.com/shadowsocks/shadowsocks-android/blob/master/src/main/jni/pdnsd/COPYING">GPLv3</a></li>
     <li>libev: <a href="https://github.com/shadowsocks/shadowsocks-libev/blob/master/libev/LICENSE">GPLv2</a></li>
     <li>libsodium: <a href="https://github.com/jedisct1/libsodium/blob/master/LICENSE">ISC</a></li>
+    <li>libudns: <a href="https://github.com/shadowsocks/libudns/blob/master/COPYING.LGPL">LGPL</a></li>
 </ul>
 
 ### LICENSE
diff --git a/mobile/src/main/assets/pages/about.html b/mobile/src/main/assets/pages/about.html
index e8d232db..3e45a17d 100644
--- a/mobile/src/main/assets/pages/about.html
+++ b/mobile/src/main/assets/pages/about.html
@@ -299,6 +299,7 @@ along with this program. If not, see <a href="http://www.gnu.org/licenses/">http
     <li>pdnsd: <a href="https://github.com/shadowsocks/shadowsocks-android/blob/master/src/main/jni/pdnsd/COPYING">GPLv3</a></li>
     <li>libev: <a href="https://github.com/shadowsocks/shadowsocks-libev/blob/master/libev/LICENSE">GPLv2</a></li>
     <li>libsodium: <a href="https://github.com/jedisct1/libsodium/blob/master/LICENSE">ISC</a></li>
+    <li>libudns: <a href="https://github.com/shadowsocks/libudns/blob/master/COPYING.LGPL">LGPL</a></li>
 </ul>
 
 </body>