diff --git a/docs/index.md b/docs/index.md
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@@ -7,6 +7,8 @@ The PHP Cache organization is dedicated to providing solid, powerful, flexible,
 
 Below you will find information about what features our libraries offer, and what adapters we have. You can also find out framework integration libraries.
 
+If you are new to PSR-6 caching you may want to have a look at our [introduction](introduction.md).
+
 ## Cache pool implementations
 
 There are plenty of adapters in this organisaion. Each of them lives in a different repository. Splitting them up in multiple packages complies with the *Common reuse principle* and makes it easier for the developer to follow the changes of a specific adapter. 
diff --git a/docs/introduction.md b/docs/introduction.md
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@@ -0,0 +1,77 @@
+# PSR-6 Cache Introduction
+ 
+In the late fall 2015 the [PHP-FIG](http://www.php-fig.org/) released a specification
+for caching. It is called [PSR-6](http://www.php-fig.org/psr/psr-6/). Like all the 
+PSRs, it is just a recommendation for improve interoperability. 
+
+## Basic concepts
+
+The PSR-6 defines two interfaces; a CachePool and a CacheItem. You interact with the 
+pool to get an item. You will never create an item yourself. 
+
+```php
+// Create a pool
+$pool = new ApcuCachePool();
+
+// Get an item (existing or new)
+$item = $pool->getItem('cache_key');
+
+// Set some values and store
+$item->set('value');
+$item->expiresAfter(60);
+$pool->save($item);
+
+// Verify existence
+$pool->hasItem('cache_key'); // True
+$item->isHit(); // True
+
+// Delete
+$pool->deleteItem('cache_key');
+$pool->hasItem('cache_key'); // False
+```
+ 
+ 
+*Note: A cache item can not be transferred from one pool to another.*
+
+## Cache keys
+
+According to PSR-6 the following characters could be used in a valid cache key; 
+`A-Z`, `a-z`, `0-9`, `_`, and `.`. Some characters are forbidden like: `{}()/\@:`. If
+you use any of the forbidden characters you will get an exception. Other characters
+(like `-`) are not forbidden nor valid. It is up to the implementation if they support
+that character or not. 
+
+**We recommend to always use valid characters in the cache key.**
+
+To make sure you do not use an invalid character by mistake, you should hash your keys. 
+ 
+```php
+$cacheKey = sha1($_SERVER['REQUEST_URI']);
+```
+
+## Choosing a pool
+
+What cache pool you  want to use is up to you. As you can see in the 
+[table on the startpage](index.md#cache-pool-implementations), different pools have
+different features. Commonly used poos are: 
+* Apcu
+* Array
+* Memcached
+* Redis
+
+The steps to create a pool varies from pool to pool. Look at the pool's repository
+to see how to create it. Generally you create an connection to a cache implementation
+and then give it to the pool. See a Memcached example: 
+
+```php
+$client = new \Memcached();
+$client->addServer('localhost', 11211);
+$pool = new MemcachedCachePool($client);
+```
+
+
+## Features
+
+The PHP-Cache organization has built some more features on top of PSR-6. Look at our
+documentation for [tagging](tagging.md), [hierarchy](hierachy.md) or 
+[namespace](namespace.md) for more information.