Update README.md

sameersbn · Sep 2, 2024 · 96bba92 · 96bba92
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@@ -983,6 +983,8 @@ Replace `x.x.x` with the version you are upgrading from. For example, if you are
 docker run --name=redmine -d [OPTIONS] sameersbn/redmine:5.1.3
 ```
 
+When an upgrade is in progress the variable `REDMINE_WAS_UPDATED` will be defined and set to `yes`.  This allows easy integration of individual upgrade-steps via `entrypoint.custom.sh`.
+
 ## Shell Access
 
 For debugging and maintenance purposes you may want access the containers shell. If you are using docker version `1.3.0` or higher you can access a running containers shell using `docker exec` command.