From d52fd16c9d704fde5e13e744a9085bb85c828421 Mon Sep 17 00:00:00 2001
From: Sokil <dmytro.sokil@gmail.com>
Date: Sun, 29 Jan 2017 19:37:49 +0200
Subject: [PATCH] requirements

---
 README.md | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/README.md b/README.md
index 2765784..4349878 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,31 @@ Schema not required in MongoDb, so we dont need to create databases, collections
 * Creating, renaming or deleting fields;
 * Creating, changing or deleting indexes
 
+Requirements
+------------
+
+* PHP 5
+ * PHP 5.3 - PHP 5.6
+ * [PHP Mongo Extension](https://pecl.php.net/package/mongo) 0.9 or above (Some features require >= 1.5)
+* PHP 7 and HHVM
+ * [PHP MongoDB Extension](https://pecl.php.net/package/mongodb) 1.0 or above
+ * [Compatibility layer](https://github.com/alcaeus/mongo-php-adapter). Please, note some [restriontions](#compatibility-with-php-7)
+ * Currently not tested in HHVM
+* Tested over MongoDB v.2.4.12, v.2.6.9, v.3.0.2, v.3.2.10, v.3.3.15, v.3.4.0 (See [Unit tests](#unit-tests))
+* [Symfony Event Dispatcher](http://symfony.com/doc/current/components/event_dispatcher/introduction.html)
+* [GeoJson version ~1.0](https://github.com/jmikola/geojson)
+* [PSR-3 logger interface](https://github.com/php-fig/log)
+<br/>
+<br/>
+
+Compatibility with PHP 7
+------------------------
+
+> PHPMongo currently based on old [ext-mongo](https://pecl.php.net/package/mongo) entension.
+> To use this ODM with PHP 7, you need to add [compatibility layer](https://github.com/alcaeus/mongo-php-adapter), which implement API of old extension over new [ext-mongodb](https://pecl.php.net/package/mongodb).
+> To start using PHPMongo with PHP7, add requirement [alcaeus/mongo-php-adapter](https://github.com/alcaeus/mongo-php-adapter) to composer.
+> Restrictions for using ODM with compatibility layer you can read in [known issues](https://github.com/alcaeus/mongo-php-adapter#known-issues) of original adapter.
+
 Installation
 ------------