diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68c09aced..7c98f2658 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 * `crud.len()` function to calculate the number of tuples
   in the space for memtx engine and calculate the maximum
   approximate number of tuples in the space for vinyl engine.
+* CRUD operations calculates bucket id automatically using sharding
+  key specified with DDL schema or in `_ddl_sharding_key` space.
 
 ## [0.8.0] - 02-07-21
 
diff --git a/README.md b/README.md
index 29ae1145b..85179bd9e 100644
--- a/README.md
+++ b/README.md
@@ -54,10 +54,12 @@ crud.unflatten_rows(res.rows, res.metadata)
 
 * A space should have a format.
 * By default, `bucket_id` is computed as `vshard.router.bucket_id_strcrc32(key)`,
-  where `key` is the primary key value.
-  Custom bucket ID can be specified as `opts.bucket_id` for each operation.
-  For operations that accepts tuple/object bucket ID can be specified as
-  tuple/object field as well as `opts.bucket_id` value.
+  where `key` is a value of sharding key. Sharding key can be set with [DDL
+  schema](https://github.com/tarantool/ddl#input-data-format) (see
+  `sharding_key` option) or in a space `_ddl_sharding_key`. By default sharding
+  key is a primary key. Custom bucket ID can be specified as `opts.bucket_id`
+  for each operation. For operations that accepts tuple/object bucket ID can be
+  specified as tuple/object field as well as `opts.bucket_id` value.
 
 ### Insert