diff --git a/docs/running-on-kubernetes.md b/docs/running-on-kubernetes.md
index 043c08bee064d..06d2e3e248b8e 100644
--- a/docs/running-on-kubernetes.md
+++ b/docs/running-on-kubernetes.md
@@ -436,6 +436,13 @@ When there exists a log collection system, you can expose it at Spark Driver `Ex
 spark.ui.custom.executor.log.url='https://log-server/log?appId={{APP_ID}}&execId={{EXECUTOR_ID}}'
 ```
 
+You can add custom variables to this url template, populated with the values of existing executor environment variables like
+
+```
+spark.executorEnv.SPARK_EXECUTOR_ATTRIBUTE_YOUR_VAR='$(EXECUTOR_ENV_VAR)'
+spark.ui.custom.executor.log.url='https://log-server/log?appId={{APP_ID}}&execId={{EXECUTOR_ID}}&your_var={{YOUR_VAR}}'
+```
+
 ### Accessing Driver UI
 
 The UI associated with any application can be accessed locally using