diff --git a/docs/micro_utils/repos/inmemory.md b/docs/micro_utils/repos/inmemory.md
new file mode 100644
index 0000000..119e453
--- /dev/null
+++ b/docs/micro_utils/repos/inmemory.md
@@ -0,0 +1,20 @@
+# In memory
+
+In memory realizations contains several simple variants:
+
+* [MapCRUDRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-map-c-r-u-d-repo/index.html)
+* [MapKeyValueRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-map-key-value-repo/index.html)
+* [MapKeyValuesRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-map-key-values-repo/index.html)
+
+Each realization contains `Write` and `Read` parents.
+
+There are several important moments:
+
+## [WriteMapCRUDRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-map-c-r-u-d-repo/index.html) (and [MapCRUDRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-map-c-r-u-d-repo/index.html))
+
+It is an abstract repo with abstract functions: `updateObject` and `createObject`. Both functions require from realization to create `Registered` variant from incoming data and
+both will be called within repo [locker.withWriteLock](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.coroutines/with-write-lock.html).
+
+You may use functions [MapCRUDRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-map-c-r-u-d-repo.html) with
+passing the callbacks `updateObject` and `createObject` which will be used in their realizations of default [MapCRUDRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-map-c-r-u-d-repo/index.html)
+variant
diff --git a/mkdocs.yml b/mkdocs.yml
index a9e1110..9eb9fba 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -12,7 +12,9 @@ nav:
           - 'micro_utils/index.md'
           - 'micro_utils/resources.md'
           - 'micro_utils/startup.md'
-          - 'micro_utils/repos/'
+          - 'Repos':
+                - 'micro_utils/repos/index.md'
+                - 'micro_utils/repos/inmemory.md'
     - 'Telegram Bot API':
         - 'tgbotapi/index.md'
         - KDocs: 'https://tgbotapi.inmo.dev'