Add abstract of catalog.

droonga · Feb 19, 2014 · a228f57 · a228f57
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commit a228f57
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diff --git a/reference/catalog/version2/index.md b/reference/catalog/version2/index.md
@@ -7,6 +7,8 @@ layout: en
 {:toc}
 
 ## Abstract {#abstract}
+`Catalog` is a JSON data to manage the configuration of a Droonga cluster.
+A Droonga cluster consists of one or more `datasets`, and a `dataset` consists of other portions. They all must be explicitly described in a `catalog` and be shared with all the hosts in the cluster.
 
 ## Usage {#usage}