diff --git a/CHANGELOG.md b/CHANGELOG.md
index e7fbaf9f..bd82b0f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 - Upgrade stomp 8.0.0 to 8.0.1 - [#832](https://github.com/jertel/elastalert2/pull/832) - @jertel
 - Add support for Kibana 8.2 for Kibana Discover, Upgrade Pytest 7.1.1 to 7.1.2, Upgrade pylint 2.13.5 to 2.13.8, Upgrade Jinja2 3.1.1 to 3.1.2 - [#840](https://github.com/jertel/elastalert2/pull/840) - @nsano-rururu
 - Add the possibility to use rule and match fields in the description of TheHive alerts - [#855](https://github.com/jertel/elastalert2/pull/855) - @luffynextgen
+- Fix missing colon on schema.yml and add unit test on it - [#866](https://github.com/jertel/elastalert2/pull/866) - @Isekai-Seikatsu
 
 # 2.5.0
 
diff --git a/elastalert/schema.yaml b/elastalert/schema.yaml
index b338c4e6..68bb6e3a 100644
--- a/elastalert/schema.yaml
+++ b/elastalert/schema.yaml
@@ -518,9 +518,9 @@ properties:
   mattermost_author_name: {type: string}
   mattermost_author_link: {type: string}
   mattermost_author_icon: {type: string}
-  mattermost_attach_kibana_discover_url {type: boolean}
-  mattermost_kibana_discover_color {type: string}
-  mattermost_kibana_discover_title {type: string}
+  mattermost_attach_kibana_discover_url: {type: boolean}
+  mattermost_kibana_discover_color: {type: string}
+  mattermost_kibana_discover_title: {type: string}
 
   ### Microsoft Teams
   ms_teams_webhook_url: *arrayOfString
@@ -590,9 +590,9 @@ properties:
   rocket_chat_msg_color: {enum: [good, warning, danger]}
   rocket_chat_text_string: {type: string}
   rocket_chat_proxy: {type: string}
-  rocket_chat_attach_kibana_discover_url {type: boolean}
-  rocket_chat_kibana_discover_color {type: string}
-  rocket_chat_kibana_discover_title {type: string}
+  rocket_chat_attach_kibana_discover_url: {type: boolean}
+  rocket_chat_kibana_discover_color: {type: string}
+  rocket_chat_kibana_discover_title: {type: string}
   rocket_chat_ca_certs: {type: boolean}
   rocket_chat_ignore_ssl_errors: {type: boolean}
   rocket_chat_timeout: {type: integer}
diff --git a/tests/loaders_test.py b/tests/loaders_test.py
index 71ec00f4..2b9e0775 100644
--- a/tests/loaders_test.py
+++ b/tests/loaders_test.py
@@ -11,8 +11,12 @@
 import elastalert.ruletypes
 from elastalert.alerters.email import EmailAlerter
 from elastalert.config import load_conf
-from elastalert.loaders import FileRulesLoader
-from elastalert.loaders import RulesLoader
+from elastalert.loaders import (
+    FileRulesLoader,
+    RulesLoader,
+    load_rule_schema,
+)
+
 from elastalert.util import EAException
 
 
@@ -622,3 +626,8 @@ def test_load_yaml_imports_modified():
             'rule_file': rule_path,
         }
         assert len(rules_loader.import_rules) == 0
+
+
+def test_load_rule_schema():
+    validator = load_rule_schema()
+    validator.check_schema(validator.schema)