diff --git a/manual-install/readme.md b/manual-install/readme.md
index ae356435d28..66cda23c12f 100644
--- a/manual-install/readme.md
+++ b/manual-install/readme.md
@@ -22,7 +22,8 @@ First, install docker and docker-compose (v2) if not already done. Then simply r
 git clone https://github.com/nextcloud/all-in-one.git
 cd all-in-one/manual-install
 ```
-Then copy the sample.conf to default environment file, e.g. `cp sample.conf .env`, open the new conf file, e.g. with `nano .env`, edit all values that are marked with `# TODO!`, close and save the file. (Note: there is no clamav image for arm64).
+Then copy the sample.conf to default environment file, e.g. `cp sample.conf .env`, open the new conf file, e.g. with `nano .env`, edit all values that are marked with `# TODO!`, close and save the file. (Note: there is no clamav image for arm64).<br>
+⚠️ **Warning**: Do not use the symbols `@` and `:` in your passwords. These symbols are used to build database connection strings. You will experience issues when using these symbols!
 
 Now copy the provided yaml file to a compose.yaml file by running `cp latest.yml compose.yaml`.
 
diff --git a/nextcloud-aio-helm-chart/readme.md b/nextcloud-aio-helm-chart/readme.md
index e0a3c916bda..b40fb97609e 100644
--- a/nextcloud-aio-helm-chart/readme.md
+++ b/nextcloud-aio-helm-chart/readme.md
@@ -18,7 +18,8 @@ You can run the containers that are build for AIO with Kubernetes using this Hel
 
 ## How to use this?
 
-First download this file: https://raw.githubusercontent.com/nextcloud/all-in-one/main/nextcloud-aio-helm-chart/values.yaml and adjust at least all values marked with `# TODO!`
+First download this file: https://raw.githubusercontent.com/nextcloud/all-in-one/main/nextcloud-aio-helm-chart/values.yaml and adjust at least all values marked with `# TODO!`<br>
+⚠️ **Warning**: Do not use the symbols `@` and `:` in your passwords. These symbols are used to build database connection strings. You will experience issues when using these symbols!
 
 Then run:
 
diff --git a/nextcloud-aio-helm-chart/values.yaml b/nextcloud-aio-helm-chart/values.yaml
index 0d383504981..0ddb92f7377 100644
--- a/nextcloud-aio-helm-chart/values.yaml
+++ b/nextcloud-aio-helm-chart/values.yaml
@@ -1,3 +1,4 @@
+# Warning: Do not use symbols "@" and ":" in your passwords (see readme.md)
 DATABASE_PASSWORD:           # TODO! This needs to be a unique and good password!
 FULLTEXTSEARCH_PASSWORD:           # TODO! This needs to be a unique and good password!
 IMAGINARY_SECRET:           # TODO! This needs to be a unique and good password!