diff --git a/homeassistant/components/ialarm/strings.json b/homeassistant/components/ialarm/strings.json
index 1ac7a25e6f89..cb2c75d74a9d 100644
--- a/homeassistant/components/ialarm/strings.json
+++ b/homeassistant/components/ialarm/strings.json
@@ -5,6 +5,9 @@
         "data": {
           "host": "[%key:common::config_flow::data::host%]",
           "port": "[%key:common::config_flow::data::port%]"
+        },
+        "data_description": {
+          "host": "The hostname or IP address of Antifurto365 iAlarm system."
         }
       }
     },
diff --git a/homeassistant/components/iotawatt/strings.json b/homeassistant/components/iotawatt/strings.json
index f21dfe0cd09e..266b32c5c313 100644
--- a/homeassistant/components/iotawatt/strings.json
+++ b/homeassistant/components/iotawatt/strings.json
@@ -4,6 +4,9 @@
       "user": {
         "data": {
           "host": "[%key:common::config_flow::data::host%]"
+        },
+        "data_description": {
+          "host": "The hostname or IP address of your IoTaWatt device."
         }
       },
       "auth": {
diff --git a/homeassistant/components/keenetic_ndms2/strings.json b/homeassistant/components/keenetic_ndms2/strings.json
index 13e3fabfbff1..765a3fc4d47c 100644
--- a/homeassistant/components/keenetic_ndms2/strings.json
+++ b/homeassistant/components/keenetic_ndms2/strings.json
@@ -9,6 +9,9 @@
           "username": "[%key:common::config_flow::data::username%]",
           "password": "[%key:common::config_flow::data::password%]",
           "port": "[%key:common::config_flow::data::port%]"
+        },
+        "data_description": {
+          "host": "The hostname or IP address of your Keenetic router."
         }
       }
     },