diff --git a/03-installing-osm.md b/03-installing-osm.md
index 05e7afa1bdb977ff695a37101ed074ec86b15c19..f736969eb930551d277aacd4b62f750c9575e7d3 100644
--- a/03-installing-osm.md
+++ b/03-installing-osm.md
@@ -461,6 +461,49 @@ helm -n osm install osm installers/helm/osm -f osm-values.yaml ${OSM_HELM_OPTS}
 helm -n osm status osm
 ```
 
+### Deploy OSM Using other databases
+
+In case you want to use an already deployed `mysql` chart, before deploying the OSM Helm chart, edit the following values inside `devops/installers/helm/osm/values.yaml`: `global.db.mysql.mysqlSecretName`, `global.db.mysql.mysqlSecretKey`, and `global.db.mysql.mysqlService` to point to your `mysql`:
+
+```yaml
+global:
+...
+  db:
+    mysql:
+      mysqlSecretName: mysql
+      mysqlSecretKey: mysql-root-password
+      mysqlService: mysql
+```
+
+In case you want to use an already deployed `mongodb` chart, before deploying the OSM Helm chart, edit the value `global.db.mongo.mongoService` to point to your `mongodb`.
+If `mongodb` was deployed with `auth.enabled=true`, then edit the values in the OSM Helm chart to match, setting `global.db.mongo.auth.enabled=true` and using `global.db.mongo.auth.secretName` and `global.db.mongo.auth.secretKeyRootPassword` to point to the existing secret.
+
+```yaml
+global:
+...
+  db:
+    mongo:
+      mongoService: mongodb-k8s
+      auth:
+        enabled: true
+        secretName: mongodb-k8s
+        secretKeyRootPassword: mongodb-root-password
+```
+
+Then, contiune to deploy the OSM Chart normally:
+
+```bash
+# Build the helm chart dependencies 
+helm dependency build installers/helm/osm
+
+# Check that there are no errors
+helm -n osm template osm installers/helm/osm -f osm-values.yaml ${OSM_HELM_OPTS}
+
+# Deploy OSM helm chart
+helm -n osm install osm installers/helm/osm -f osm-values.yaml ${OSM_HELM_OPTS}
+helm -n osm status osm
+```
+
 ### Deploy NG-SA
 
 ```bash