diff --git a/README.md b/README.md
index 32e1caf..bb32c4d 100644
--- a/README.md
+++ b/README.md
@@ -187,7 +187,7 @@ reaction_removed
 2. Configure the git account, the local repo and the remote path, which should be used to access your git repository.
 
 Example:
-```
+```json
 {
     "git_repopath" : "/home/ota_bot/OTA_Upload",
     "git_repouser" : "otabot",
@@ -215,7 +215,7 @@ Note: If you configure the solvetracker this way, you need to make sure you are
 5. Add a link to your repo, so people can look it up via `showlinkurl`
 
 Example:
-```
+```json
 {
     "git_repo": "reponame/links",
     "git_branch": "gh-pages",
@@ -232,7 +232,7 @@ To enable archive reminders set an offset (in hours) in _config/config.json_ for
 If active, the bot will create a reminder for every bot admin on `!endctf` to inform him, when the ctf was finished for the specified time and it should be archived.
 
 Example (for being reminded one week after the ctf has finished):
-```
+```json
 {
     ...
     "archive_ctf_reminder_offset" : "168"
@@ -241,11 +241,10 @@ Example (for being reminded one week after the ctf has finished):
 
 ## Log command deletion
 
-To enable logging of deleting messages containing specific keywords, set `delete_watch_keywords` in _config/config.json_ to a comma separated list of keywords. 
-Clear or remove the setting to disable deletion logging.
+To enable logging of deleting messages containing specific keywords, set `delete_watch_keywords` in _config/config.json_ to an array of strings to watch for.
 
 Example
-```
+```json
 {
-    "delete_watch_keywords" : "workon, reload, endctf"
+    "delete_watch_keywords" : ["workon", "reload", "endctf"]
 }
diff --git a/config/config.json.template b/config/config.json.template
index 6959cc1..3ffdffc 100644
--- a/config/config.json.template
+++ b/config/config.json.template
@@ -8,7 +8,7 @@
   "wolfram_app_id" : "",
   "archive_ctf_reminder_offset" : "168",
   "archive_everything": true,
-  "delete_watch_keywords" : "",
+  "delete_watch_keywords" : [],
   "intro_message" : "",
   "private_ctfs": false,
   "allow_signup": false,
diff --git a/server/botserver.py b/server/botserver.py
index 5a2a108..31d3c68 100644
--- a/server/botserver.py
+++ b/server/botserver.py
@@ -85,30 +85,28 @@ def parse_slack_message(self, message_list):
             if msg.get("type") == "message" and "subtype" not in msg:
                 if self.bot_at in msg.get("text", ""):
                     # Return text after the @ mention, whitespace removed
-                    return msg['text'].split(self.bot_at)[1].strip(), msg['channel'], msg['thread_ts'] if 'thread_ts' in msg else msg['ts'], msg['user']
+                    return msg["text"].split(self.bot_at)[1].strip(), msg["channel"], msg["thread_ts"] if "thread_ts" in msg else msg["ts"], msg["user"]
                 elif msg.get("text", "").startswith("!"):
                     # Return text after the !
-                    return msg['text'][1:].strip(), msg['channel'], msg['thread_ts'] if 'thread_ts' in msg else msg['ts'], msg['user']
+                    return msg["text"][1:].strip(), msg["channel"], msg["thread_ts"] if "thread_ts" in msg else msg["ts"], msg["user"]
             # Check if user tampers with channel purpose
             elif msg.get("type") == "message" and msg["subtype"] == "channel_purpose" and msg["user"] != self.bot_id:
-                source_user = get_display_name(resolve_user_by_user_id(self.slack_wrapper, msg['user']))
-                warning = "*User '{}' changed the channel purpose ```{}```*".format(source_user, msg['text'])
-                self.slack_wrapper.post_message(msg['channel'], warning)
+                source_user = get_display_name(resolve_user_by_user_id(self.slack_wrapper, msg["user"]))
+                warning = "*User "{}" changed the channel purpose ```{}```*".format(source_user, msg["text"])
+                self.slack_wrapper.post_message(msg["channel"], warning)
             # Check for deletion of messages containing keywords
             elif "subtype" in msg and msg["subtype"] == "message_deleted":
-                log_deletions = self.get_config_option("delete_watch_keywords")
+                delete_keywords = self.get_config_option("delete_watch_keywords")
 
-                if log_deletions:
-                    previous_msg = msg['previous_message']['text']
-                    delete_keywords = log_deletions.split(",")
+                previous_msg = msg["previous_message"]["text"]
 
-                    if any(keyword.strip() in previous_msg for keyword in delete_keywords):
-                        user_name = self.slack_wrapper.get_member(msg['previous_message']['user'])
-                        display_name = get_display_name(user_name)
-                        self.slack_wrapper.post_message(msg['channel'], "*{}* deleted : `{}`".format(display_name, previous_msg))
+                if any(keyword in previous_msg for keyword in delete_keywords):
+                    user_name = self.slack_wrapper.get_member(msg["previous_message"]["user"])
+                    display_name = get_display_name(user_name)
+                    self.slack_wrapper.post_message(msg["channel"], "*{}* deleted : `{}`".format(display_name, previous_msg))
             # Greet new users
             elif msg.get("type") == "im_created":
-                self.slack_wrapper.post_message(msg['user'], self.get_config_option("intro_message"))
+                self.slack_wrapper.post_message(msg["user"], self.get_config_option("intro_message"))
 
         return None, None, None, None