README.md in snapshot-0.2.2 vs README.md in snapshot-0.2.3

@@ -191,9 +191,14 @@
 
 ```ruby
 ios_version "9.0"
 ```
 
+### Custom Build Command
+If for some reason, the default build command does not work for your project, you can pass your own build script. The script will be executed **once** before the tests are being run.
+
+**Make sure** you are setting the output path to ```/tmp/snapshot```.
+
 
 # Tips
 ## Available language codes
 ```ruby
 ["da-DK", "de-DE", "el-GR", "en-AU", "en-CA", "en-GB", "en-US", "es-ES", "es-MX", "fi-FI", "fr-CA", "fr-FR", "id-ID", "it-IT", "ja-JP", "ko-KR", "ms-MY", "nl-NL", "no-NO", "pt-BR", "pt-PT", "ru-RU", "sv-SE", "th-TH", "tr-TR", "vi-VI", "cmn-Hans", "zh_CN", "cmn-Hant"]