diff --git a/docs/micro_utils/repos/index.md b/docs/micro_utils/repos/index.md
new file mode 100644
index 0000000..99f3a81
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+++ b/docs/micro_utils/repos/index.md
@@ -0,0 +1,56 @@
+# Repos
+
+Repositories in this library are unified interfaces to work with different types of standard repos:
+
+* CRUD (create/read/update/delete)
+* Key-value
+* Key-value**s**
+
+## CRUD
+
+Default interface for any `CRUD`-oriented realization of repositories. This type of repos separated to three interfaces:
+
+* [ReadCRUDRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-read-c-r-u-d-repo/index.html)
+* [WriteCRUDRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/index.html)
+* [CRUDRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-c-r-u-d-repo/index.html)
+
+```mermaid
+flowchart TB
+    ReadCRUDRepo --> CRUDRepo
+    WriteCRUDRepo --> CRUDRepo
+```
+
+`CRUDRepo` extends both `ReadCRUDRepo` and `WriteCRUDRepo`.
+
+CRUD repos __do not__ support forced placing of data by id when data is not in repo. That means, that you can't set data in repo by id
+which absent in the repository.
+
+### `ReadCRUDRepo`
+
+Contains read-only operations, such as [getById](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-read-c-r-u-d-repo/get-by-id.html),
+[contains](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-read-c-r-u-d-repo/contains.html). This interface can't be observed because of it does not suppose
+any mutable operation.
+
+### `WriteCRUDRepo`
+
+Contains write-only operations, such as [create](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/create.html),
+[update](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/update.html). This interface can be observed via its flows:
+
+* [newObjectsFlow](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/new-objects-flow.html) for newely
+[create](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/create.html)d objects
+* [updatedObjectsFlow](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/updated-objects-flow.html) for old
+[update](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/update.html)d objects
+* [deletedObjectsIdsFlow](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/deleted-objects-ids-flow.html) for
+[delete](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-c-r-u-d-repo/delete-by-id.html)d objects
+
+> INFO:
+> 
+> By default, all mutating operations consumes `List`s of data (`List<New>` for `create`, `List<Pair<Id, New>>` for `update` and `List<Id>` for delete),
+> but all they have their extension function-variations with one/two args (like `create` with `New` arg)
+
+`create` operation consumes list of `New` variants of object and produces `Registered`s list. In most cases, `Registered` variant of object should have
+`Id` of registered object, but it is not required for repo.
+
+`update` operation consumes list of pairs with `Id` and `New` objects and produces list of `Registered` objects.
+
+`deleteById` operation consumes list of `Id`s and do not consume anything except of notifying via `deletedObjectsIdsFlow`.
diff --git a/mkdocs.yml b/mkdocs.yml
index ddc410d..a9e1110 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -12,6 +12,7 @@ nav:
           - 'micro_utils/index.md'
           - 'micro_utils/resources.md'
           - 'micro_utils/startup.md'
+          - 'micro_utils/repos/'
     - 'Telegram Bot API':
         - 'tgbotapi/index.md'
         - KDocs: 'https://tgbotapi.inmo.dev'