diff --git a/core/kcconf.py b/core/kcconf.py
index d6f5f83..663d726 100644
--- a/core/kcconf.py
+++ b/core/kcconf.py
@@ -1,61 +1,77 @@
-"""This module provides functions for easy editing of kopano config files \
-via environment variables"""
-
-import re
-import os
-import os.path
-
-def configkopano(configs):
-    for filename, config in configs.items():
-        if not os.path.exists(filename):
-            return
-        with open(filename) as f:
-            contents = f.read()
-        f.close()
-
-        for key, newvalue in config.items():
-            if key == "kccomment":
-                for line in newvalue:
-                    contents = re.sub(r"^\s*" + re.escape(line), r"#{}".format(line), contents, 0, re.MULTILINE)
-            elif key == "kcuncomment":
-                for line in newvalue:
-                    contents = re.sub(r"^\s*#\s*" + re.escape(line) , line, contents, 0, re.MULTILINE)
-            else:
-                contents = re.sub(r"^\s*#?\s*{}\s*=.*".format(key), r"{} = {}".format(key, newvalue), contents, 0, re.MULTILINE)
-
-        with open(filename, "w") as f:
-            f.write(contents)
-        f.close()
-
-def parseenvironmentvariables(prependingpath):
-    configs = dict()
-
-    for name, value in os.environ.items():
-        namematch = re.match(r"^KCCONF_([A-Z]+)_([A-Z0-9_]+)$", name)
-        if namematch != None:
-            filename = namematch.group(1).lower() + ".cfg"
-            if prependingpath + filename not in configs:
-                configs[prependingpath + filename] = dict()
-            confkey = namematch.group(2).lower()
-            configs[prependingpath + filename][confkey] = value
-        commentmatch = re.match(r"^KCCOMMENT_([A-Z]+)_([A-Z0-9_]+)$", name)
-        if commentmatch != None:
-            filename = commentmatch.group(1).lower() + ".cfg"
-            if prependingpath + filename not in configs:
-                configs[prependingpath + filename] = dict()
-            try: 
-                configs[prependingpath + filename]["kccomment"].append(value)
-            except KeyError:
-                configs[prependingpath + filename]["kccomment"] = []
-                configs[prependingpath + filename]["kccomment"].append(value)
-        uncommentmatch = re.match(r"^KCUNCOMMENT_([A-Z]+)_([A-Z0-9_]+)$", name)
-        if uncommentmatch != None:
-            filename = uncommentmatch.group(1).lower() + ".cfg"
-            if prependingpath + filename not in configs:
-                configs[prependingpath + filename] = dict()
-            try: 
-                configs[prependingpath + filename]["kcuncomment"].append(value)
-            except KeyError:
-                configs[prependingpath + filename]["kcuncomment"] = []
-                configs[prependingpath + filename]["kcuncomment"].append(value)
-    return configs
+"""This module provides functions for easy editing of kopano config files
+via environment variables"""
+
+import re
+import os
+import os.path
+
+def configkopano(configs):
+    """ Changes configuration files according to configs typically returned from parseenvironmentvariables(..)"""
+    for filename, config in configs.items():
+        if not os.path.exists(filename):
+            return
+        # read configuration file
+        with open(filename) as f:
+            contents = f.read()
+        f.close()
+
+        for key, newvalue in config.items():
+            if key == "kccomment":
+                # comment lines
+                for line in newvalue:
+                    contents = re.sub(r"^\s*" + re.escape(line), r"#{}".format(line), contents, 0, re.MULTILINE)
+            elif key == "kcuncomment":
+                # uncomment lines
+                for line in newvalue:
+                    contents = re.sub(r"^\s*#\s*" + re.escape(line) , line, contents, 0, re.MULTILINE)
+            else:
+                # find config line
+                if re.search(r"^\s*#?\s*{}\s*=.*".format(key), contents, re.MULTILINE) == None:
+                    # add configuration as new line
+                    contents += "\n{} = {}".format(key, newvalue)
+                else:
+                    # change existing line
+                    contents = re.sub(r"^\s*#?\s*{}\s*=.*".format(key), r"{} = {}".format(key, newvalue), contents, 0, re.MULTILINE)
+
+        # save new configuration
+        with open(filename, "w") as f:
+            f.write(contents)
+        f.close()
+
+def parseenvironmentvariables(prependingpath):
+    """ Parse all environment variables starting with KCCONF_, KCCOMMENT_ and KCUNCOMMENT_ and 
+    return as multi dimensional dict """
+    configs = dict()
+
+    for name, value in os.environ.items():
+        # parse change/add configuration commands
+        namematch = re.match(r"^KCCONF_([A-Z]+)_([A-Z0-9_]+)$", name)
+        if namematch != None:
+            filename = namematch.group(1).lower() + ".cfg"
+            if prependingpath + filename not in configs:
+                configs[prependingpath + filename] = dict()
+            confkey = namematch.group(2).lower()
+            configs[prependingpath + filename][confkey] = value
+        # parse comment configuration commands
+        commentmatch = re.match(r"^KCCOMMENT_([A-Z]+)_([A-Z0-9_]+)$", name)
+        if commentmatch != None:
+            filename = commentmatch.group(1).lower() + ".cfg"
+            if prependingpath + filename not in configs:
+                configs[prependingpath + filename] = dict()
+            try: 
+                configs[prependingpath + filename]["kccomment"].append(value)
+            except KeyError:
+                configs[prependingpath + filename]["kccomment"] = []
+                configs[prependingpath + filename]["kccomment"].append(value)
+        # parse uncomment configuration commands
+        uncommentmatch = re.match(r"^KCUNCOMMENT_([A-Z]+)_([A-Z0-9_]+)$", name)
+        if uncommentmatch != None:
+            filename = uncommentmatch.group(1).lower() + ".cfg"
+            if prependingpath + filename not in configs:
+                configs[prependingpath + filename] = dict()
+            try: 
+                configs[prependingpath + filename]["kcuncomment"].append(value)
+            except KeyError:
+                configs[prependingpath + filename]["kcuncomment"] = []
+                configs[prependingpath + filename]["kcuncomment"].append(value)
+    return configs