diff --git a/homeassistant/components/modbus/services.yaml b/homeassistant/components/modbus/services.yaml
index 8713257b47c..2158528814f 100644
--- a/homeassistant/components/modbus/services.yaml
+++ b/homeassistant/components/modbus/services.yaml
@@ -1,7 +1,7 @@
 write_coil:
   description: Write to a modbus coil.
   fields:
-    address: {description: Address of the register to read., example: 0}
+    address: {description: Address of the register to write to., example: 0}
     state: {description: State to write., example: false}
     unit: {description: Address of the modbus unit., example: 21}
 write_register: