diff --git a/README.md b/README.md
index c2f01c0..733a895 100755
--- a/README.md
+++ b/README.md
@@ -27,6 +27,16 @@ e.g.:
     sqlalchemy.url --> CKAN___SQLALCHEMY__URL
     beaker.session.secret --> CKAN___BEAKER__SESSION__SECRET
 
+
+Starting from CKAN 2.10 (and ckanext-envvars 0.0.4), if a configuration option is defined using CKAN's
+[configuration declaration](https://docs.ckan.org/en/latest/maintaining/configuration.html#config-declaration)
+the key is not further processed. This allows to keep eg upper case setttings like SECRET_KEY, WTF_CSRF_ENABLED, e.g:
+
+    SECRET_KEY --> CKAN___SECRET_KEY
+    WTF_CSRF_ENABLED --> CKAN___WTF_CSRF_ENABLED
+
+
+
 Requirements
 ------------
 
diff --git a/setup.py b/setup.py
index 0fdf894..495535c 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
     # Versions should comply with PEP440.  For a discussion on single-sourcing
     # the version across setup.py and the project code, see
     # http://packaging.python.org/en/latest/tutorial.html#version
-    version='0.0.3',
+    version='0.0.4',
 
     description='''CKAN configuration settings available from env vars''',
     long_description=long_description,