readme: mention GITLAB_SECRETS_DB_KEY_BASE parameter in upgrading s…

…ection Refer #443
sameersbn · Sep 29, 2015 · 3a9e3fc · 3a9e3fc
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diff --git a/README.md b/README.md
@@ -1004,6 +1004,8 @@ Replace `x.x.x` with the version you are upgrading from. For example, if you are
 
 - **Step 4**: Start the image
 
+> **Note**: Since GitLab `8.0.0` you need to provide the `GITLAB_SECRETS_DB_KEY_BASE` parameter while starting the image.
+
 ```bash
 docker run --name gitlab -d [OPTIONS] sameersbn/gitlab:8.0.2
 ```