diff --git a/src/oncall/bin/notifier.py b/src/oncall/bin/notifier.py
index 25142b8..cbc92aa 100644
--- a/src/oncall/bin/notifier.py
+++ b/src/oncall/bin/notifier.py
@@ -32,11 +32,29 @@ send_queue = queue.Queue()
 
 default_timezone = None
 
+def merge_dict(extend_me, extend_by):
+    if isinstance(extend_by, dict):
+        for k, v in extend_by.items():
+            if isinstance(v, dict) and isinstance(extend_me.get(k), dict):
+                merge_dict(extend_me[k], v)
+            else:
+                extend_me[k] = v
+    return extend_me
 
 def load_config_file(config_path):
     with open(config_path, 'r', encoding='utf-8') as h:
         config = yaml.safe_load(h)
 
+    # Check for extra config files from environment variable
+    extra_config_paths = os.getenv('ONCALL_EXTRA_CONFIG')
+    if extra_config_paths:
+        for extra_path in extra_config_paths.split(','):
+            extra_path = extra_path.strip()
+            if os.path.isfile(extra_path):
+                with open(extra_path, 'r') as f:
+                    extra_config = yaml.safe_load(f) or {}
+                config = merge_dict(config, extra_config)
+
     if 'init_config_hook' in config:
         try:
             module = config['init_config_hook']
diff --git a/src/oncall/user_sync/ldap_sync.py b/src/oncall/user_sync/ldap_sync.py
index ef9a8ec..c5f027d 100644
--- a/src/oncall/user_sync/ldap_sync.py
+++ b/src/oncall/user_sync/ldap_sync.py
@@ -6,6 +6,7 @@ import time
 import yaml
 import logging
 import ldap
+import os
 
 from oncall import metrics
 from ldap.controls import SimplePagedResultsControl
@@ -447,9 +448,28 @@ def main(config):
         logger.info('Sleeping for %s seconds' % sleep_time)
         sleep(sleep_time)
 
+def merge_dict(extend_me, extend_by):
+    if isinstance(extend_by, dict):
+        for k, v in extend_by.items():
+            if isinstance(v, dict) and isinstance(extend_me.get(k), dict):
+                merge_dict(extend_me[k], v)
+            else:
+                extend_me[k] = v
+    return extend_me
 
 if __name__ == '__main__':
     config_path = sys.argv[1]
     with open(config_path, 'r', encoding='utf-8') as config_file:
         config = yaml.safe_load(config_file)
+
+    # Check for extra config files from environment variable
+    extra_config_paths = os.getenv('ONCALL_EXTRA_CONFIG')
+    if extra_config_paths:
+        for extra_path in extra_config_paths.split(','):
+            extra_path = extra_path.strip()
+            if os.path.isfile(extra_path):
+                with open(extra_path, 'r') as f:
+                    extra_config = yaml.safe_load(f) or {}
+                config = merge_dict(config, extra_config)
+
     main(config)
diff --git a/src/oncall/utils.py b/src/oncall/utils.py
index a0b695c..278ca1d 100644
--- a/src/oncall/utils.py
+++ b/src/oncall/utils.py
@@ -13,6 +13,7 @@ from pytz import timezone
 from .constants import ONCALL_REMINDER
 from . import constants
 import re
+import os
 
 invalid_char_reg = re.compile(r'[!"#%-,\.\/;->@\[-\^`\{-~]+')
 DAY = 86400
@@ -27,10 +28,31 @@ def insert_notification(x, y):
 def update_notification(x, y):
     pass
 
+def merge_dict(extend_me, extend_by):
+    if isinstance(extend_by, dict):
+        for k, v in extend_by.items():
+            if isinstance(v, dict) and isinstance(extend_me.get(k), dict):
+                merge_dict(extend_me[k], v)
+            else:
+                extend_me[k] = v
+    return extend_me
 
 def read_config(config_path):
+
     with open(config_path, 'r', encoding='utf8') as config_file:
-        return yaml.safe_load(config_file)
+        config = yaml.safe_load(config_file)
+
+    # Check for extra config files from environment variable
+    extra_config_paths = os.getenv('ONCALL_EXTRA_CONFIG')
+    if extra_config_paths:
+        for extra_path in extra_config_paths.split(','):
+            extra_path = extra_path.strip()
+            if os.path.isfile(extra_path):
+                with open(extra_path, 'r') as f:
+                    extra_config = yaml.safe_load(f) or {}
+                config = merge_dict(config, extra_config)
+
+    return config
 
 
 def create_notification(context, team_id, role_ids, type_name, users_involved, cursor, **kwargs):