diff --git a/homeassistant/components/roku/strings.json b/homeassistant/components/roku/strings.json
index 04348bc3bfb..62f1f8b1736 100644
--- a/homeassistant/components/roku/strings.json
+++ b/homeassistant/components/roku/strings.json
@@ -47,7 +47,7 @@
         "name": "Supports AirPlay"
       },
       "supports_ethernet": {
-        "name": "Supports ethernet"
+        "name": "Supports Ethernet"
       },
       "supports_find_remote": {
         "name": "Supports find remote"
diff --git a/tests/components/roku/test_binary_sensor.py b/tests/components/roku/test_binary_sensor.py
index ad27a857101..c3aec4f0968 100644
--- a/tests/components/roku/test_binary_sensor.py
+++ b/tests/components/roku/test_binary_sensor.py
@@ -50,7 +50,7 @@ async def test_roku_binary_sensors(
     assert entry.unique_id == f"{UPNP_SERIAL}_supports_ethernet"
     assert entry.entity_category == EntityCategory.DIAGNOSTIC
     assert state.state == STATE_ON
-    assert state.attributes.get(ATTR_FRIENDLY_NAME) == "My Roku 3 Supports ethernet"
+    assert state.attributes.get(ATTR_FRIENDLY_NAME) == "My Roku 3 Supports Ethernet"
     assert ATTR_DEVICE_CLASS not in state.attributes
 
     state = hass.states.get("binary_sensor.my_roku_3_supports_find_remote")
@@ -125,7 +125,7 @@ async def test_rokutv_binary_sensors(
     assert entry.entity_category == EntityCategory.DIAGNOSTIC
     assert state.state == STATE_ON
     assert (
-        state.attributes.get(ATTR_FRIENDLY_NAME) == '58" Onn Roku TV Supports ethernet'
+        state.attributes.get(ATTR_FRIENDLY_NAME) == '58" Onn Roku TV Supports Ethernet'
     )
     assert ATTR_DEVICE_CLASS not in state.attributes