diff --git a/homeassistant/components/modbus/services.yaml b/homeassistant/components/modbus/services.yaml
index 48e9e815aaa..8713257b47c 100644
--- a/homeassistant/components/modbus/services.yaml
+++ b/homeassistant/components/modbus/services.yaml
@@ -9,4 +9,4 @@ write_register:
   fields:
     address: {description: Address of the holding register to write to., example: 0}
     unit: {description: Address of the modbus unit., example: 21}
-    value: {description: Value (single value or array) to write., example: 0 or [4,0]}
+    value: {description: Value (single value or array) to write., example: "0 or [4,0]"}