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README.md

@@ -75,7 +75,21 @@ http POST localhost:8000 < token.asc
 
 ## Running tests
 
+## Configuration
+
+The configuration is made through environment variables.
+
+### Databases access
+For convenience, all the database connection parameters (except password) are hardcoded when `RUNMODE` is set to `production` or `preproduction`
+
+Look at `eidawsauth/config.py` to see the list en environments needed. Tere are sensitive defaults for RESIF.
+
+Minimal environment for RESIF is 
 
+  * `RUNMODE`: set to `production` or `preproduction`
+  * `PGPASSWORD`: if same user is set for both databases, this value will be used for both. Otherwise, set `RESIFINV_PGPASSWORD` and `RESIFAUTH_PGPASSWORD`
+  
+  
 
 # Explanations