diff --git a/docs/custom_conf.py b/docs/custom_conf.py
index fb14823a1..fbe2a7350 100644
--- a/docs/custom_conf.py
+++ b/docs/custom_conf.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import datetime
+import os
 import pathlib
 import sys
 
@@ -137,6 +138,9 @@
     # Valid options: none, prev, next, both
     'sequential_nav': 'none',
 }
+# Addons-by-default, see: https://about.readthedocs.com/blog/2024/07/addons-by-default/
+if os.environ.get('READTHEDOCS', '') == 'True':
+    html_context['READTHEDOCS'] = True
 
 # If your project is on documentation.ubuntu.com, specify the project
 # slug (for example, "lxd") here.