Update advanced.md (#4634)

blakeblackshear · Dec 8, 2022 · fee3418 · fee3418
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diff --git a/docs/docs/configuration/advanced.md b/docs/docs/configuration/advanced.md
@@ -33,6 +33,13 @@ Examples of available modules are:
 
 This section can be used to set environment variables for those unable to modify the environment of the container (ie. within HassOS)
 
+Example:
+
+```yaml
+environment_vars:
+  VARIABLE_NAME: variable_value
+```
+
 ### `database`
 
 Event and recording information is managed in a sqlite database at `/media/frigate/frigate.db`. If that database is deleted, recordings will be orphaned and will need to be cleaned up manually. They also won't show up in the Media Browser within Home Assistant.