diff --git a/source/_data/glossary.yml b/source/_data/glossary.yml
index 4b0ed4611a5..d25a4e9caed 100644
--- a/source/_data/glossary.yml
+++ b/source/_data/glossary.yml
@@ -140,6 +140,12 @@
   link: /docs/scripts/conditions/
   aliases:
     - conditions
+- term: Configuration file
+  aliases:
+    - configuration.yaml
+  definition: >-
+    The configuration.yaml file is the main configuration file for Home Assistant. It lists the integrations to be loaded and their specific configurations. In some cases, the configuration needs to be edited manually directly in the configuration.yaml file. Most integrations can be configured in the UI.
+  link: /docs/configuration/
 - term: Cover
   definition: >-
     Covers are devices such as blinds, garage doors, etc that can be opened and