diff --git a/docs/install/docker.md b/docs/install/docker.md
index 60171a3c..2c1c102e 100644
--- a/docs/install/docker.md
+++ b/docs/install/docker.md
@@ -10,6 +10,11 @@ For more information about using Docker, see the [Docker Docs](https://docs.dock
 
     By default, Docker will pull the image from Docker Hub if it is not available locally.
 
+## Prerequisites
+
+* You need to deploy MongoDB or Percona Server for MongoDB. See [what MongoDB deployments are supported](../details/deployments.md).
+* [Create the pbm user](initial-setup.md#create-the-pbm-user) in your deployment. You will need this user credentials to start Percona Backup for MongoDB container. 
+
 ## Start Percona Backup for MongoDB 
 
 Start Percona Backup for MongoDB container with the following command:
diff --git a/docs/release-notes/2.3.1.md b/docs/release-notes/2.3.1.md
index c673890e..bc60f044 100644
--- a/docs/release-notes/2.3.1.md
+++ b/docs/release-notes/2.3.1.md
@@ -23,4 +23,3 @@ Percona Backup for MongoDB is a distributed, low-impact solution for consistent
 
 * [PBM-1193](https://jira.percona.com/browse/PBM-1193) - Fixed the `pbm-agent` failure when the connection to PSMDB is lost
 
- 
\ No newline at end of file
diff --git a/mkdocs-base.yml b/mkdocs-base.yml
index 3e604f5e..17e6a5f0 100644
--- a/mkdocs-base.yml
+++ b/mkdocs-base.yml
@@ -121,7 +121,7 @@ plugins:
   with-pdf: # https://github.com/orzih/mkdocs-with-pdf
           output_path: '_pdf/PerconaBackupforMongoDB.pdf'
           cover_title: 'Backup for MongoDB Documentation'
-          cover_subtitle: 2.3.0 (September 25, 2023)
+          cover_subtitle: 2.3.1 (December 4, 2023)
           author: 'Percona Technical Documentation Team'
           cover_logo: docs/_images/Percona_Logo_Color.png
           debug_html: false