diff --git a/homeassistant/components/mqtt/strings.json b/homeassistant/components/mqtt/strings.json
index 68fa39bfdc9..6197e580b1d 100644
--- a/homeassistant/components/mqtt/strings.json
+++ b/homeassistant/components/mqtt/strings.json
@@ -181,7 +181,7 @@
         },
         "qos": {
           "name": "QoS",
-          "description": "Quality of Service to use. O. At most once. 1: At least once. 2: Exactly once."
+          "description": "Quality of Service to use. 0: At most once. 1: At least once. 2: Exactly once."
         },
         "retain": {
           "name": "Retain",