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doc/modules/mod_caps.md

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+# Entity Capabilities Module
+
+## Purpose
+This module provides a presence-based mechanism 
+for exchanging information about entity capabilities
+as defined in [XEP-0115](https://xmpp.org/extensions/xep-0115.html).
+It requests and caches Entity Capabilities from clients.
+
+## Configuration
+This module expects two optional arguments that apply to [cache tab](https://github.com/processone/cache_tab):
+* cache_size (default: 1000) - the size of a cache_tab (the amount of entries) holding the information about capabilities of each user. 
+* cache_life_time (default: 86) - time (in seconds) after which entries will be removed