--- a/configmix/__init__.py	Thu May 09 09:27:23 2019 +0200
+++ b/configmix/__init__.py	Thu May 09 09:37:51 2019 +0200
@@ -53,17 +53,26 @@
                        settings where the settings from `files` are merged
                        into
     :type defaults: dict-alike or None
+    :keyword extras: optional configuration dictionary that will applied
+                     last
+
+                     Use this for example to overwrite configuration file
+                     settings from commandline arguments.
+    :type extras: dict-alike or None
     :returns: the configuration
     :rtype: ~configmix.config.Configuration
 
     """
     defaults = kwargs.get("defaults")
+    extras = kwargs.get("extras")
     if defaults is None:
         ex = Configuration()
     else:
         ex = merge(None, Configuration(defaults))
     for f in files:
         ex = merge(_load_cfg_from_file(f), ex)
+    if extras:
+        ex = merge(Configuration(extras), ex)
     return Configuration(ex)
 
 
@@ -73,12 +82,15 @@
 
     """
     defaults = kwargs.get("defaults")
+    extras = kwargs.get("extras")
     if defaults is None:
         ex = Configuration()
     else:
         ex = safe_merge(None, Configuration(defaults))
     for f in files:
         ex = safe_merge(_load_cfg_from_file(f), ex)
+    if extras:
+        ex = safe_merge(Configuration(extras), ex)        
     return Configuration(ex)