diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index fba7096bf..37c76d9d3 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -144,9 +144,13 @@ Before you submit a pull request, please test your changes. Verify that Telegram
 
 ### Write a good commit message
 
-Explain why you make the changes. [More infos about a good commit message.][commit_message]
-Maybe reference also the related issue in your commit message.
-Don't forget to [sign your patch](#sign-your-work) to put it in the public domain.
+* Explain why you make the changes. [More infos about a good commit message.][commit_message]
+
+* If you fix an issue with your commit, please close the issue by [adding one of the keywords and the issue number][closing-issues-via-commit-messages] to your commit message.
+
+  For example: `Fix #545`
+
+* Don't forget to [sign your patch](#sign-your-work) to put it in the public domain!
 
 [//]: # (LINKS)
 [telegram]: https://telegram.org/
@@ -155,3 +159,4 @@ Don't forget to [sign your patch](#sign-your-work) to put it in the public domai
 [commit_message]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
 [pr]: https://github.com/telegramdesktop/tdesktop/compare
 [build_instructions]: https://github.com/telegramdesktop/tdesktop/blob/master/README.md#build-instructions
+[closing-issues-via-commit-messages]: https://help.github.com/articles/closing-issues-via-commit-messages/
diff --git a/Telegram/Resources/art/newmsg.wav b/Telegram/Resources/art/newmsg.wav
index 262941fa2..ca7508e1b 100644
Binary files a/Telegram/Resources/art/newmsg.wav and b/Telegram/Resources/art/newmsg.wav differ
diff --git a/Telegram/Resources/langs/download.sh b/Telegram/Resources/langs/download.sh
index 1f622d3d2..5a6d6a103 100755
--- a/Telegram/Resources/langs/download.sh
+++ b/Telegram/Resources/langs/download.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 set -e
 FullExecPath=$PWD
 pushd `dirname $0` > /dev/null
diff --git a/doc/building-cmake.md b/doc/building-cmake.md
index 0420ff245..a8b9e79ef 100644
--- a/doc/building-cmake.md
+++ b/doc/building-cmake.md
@@ -27,7 +27,7 @@ By git – in Terminal go to **/home/user/TBuild** and run
 
 Install dev libraries
 
-    sudo apt-get install libexif-dev liblzma-dev libz-dev libssl-dev libappindicator-dev libunity-dev libicu-dev
+    sudo apt-get install libexif-dev liblzma-dev libz-dev libssl-dev libappindicator-dev libunity-dev libicu-dev libdee-dev
 
 ####zlib 1.2.8