diff --git a/README.md b/README.md
index 6be7332..7cc32f3 100644
--- a/README.md
+++ b/README.md
@@ -18,14 +18,20 @@ For a full deployment see: [comming soon ...]()
 
 ## understand environment
 For the configuration (primarily the initial setup) I use a similar method as: https://hub.docker.com/r/icinga/icingaweb2  
-* In my case a prefix like `ICINGAWEB2_CONF` refers a configuration file.  
-* After the first `.` it follows the `Section` from this ini file.  
-* After the second `.` it follows the `Key` from this `Section` before.  
+* In my case a prefix like `ICINGAWEB2_CONF` refers a configuration file. 
+* As a separator I no (longer) use `.` rather `__` (2x `_`)
+* After the first `__` it follows the `Section` from this ini file.  
+* After the second `__` it follows the `Key` from this `Section` before.  
 * And after the `=` is comes the `value`.  
+* As long as you don't need `.` in `Section`'s or `Key`'s you can use both spellings of docker compose environment
 
 So will this: 
 ```
-ICINGAWEB2_CONF.global.config_backend=db
+ICINGAWEB2_CONF__global__config_backend=db
+```
+or
+```
+ICINGAWEB2_CONF__global__config_backend: db
 ```
 
 create this: