diff --git a/docs/internationalization/core.md b/docs/internationalization/core.md
index 4294e063..a5d07517 100644
--- a/docs/internationalization/core.md
+++ b/docs/internationalization/core.md
@@ -467,6 +467,24 @@ If your integration provides entities under its domain, you will want to transla
 }
 ```
 
+#### Unit of measurement of entities
+
+Integrations can provide translations for units of measurement of its entities. To do this, provide an `entity` object, that contains translations for the units and set the entity's `translation_key` property to a key under a domain in the `entity` object.
+If the entity's `translation_key` property is not `None` and the `entity` object provides a translated unit, `SensorEntityDescription.native_unit_of_measurement` and `NumberEntityDescription.native_unit_of_measurement` will be ignored.
+
+The following example `strings.json` is for a `sensor` entity with its `translation_key` property set to `goal`:
+```json
+{
+  "entity": {
+    "sensor": {
+      "goal": {
+        "unit_of_measurement": "steps"
+      }
+    }
+  }
+}
+```
+
 ## Test translations
 
 In order to test changes to translation files, the translation strings must be compiled into Home Assistant’s translation directories by running the following script: