diff --git a/source/_integrations/modbus.markdown b/source/_integrations/modbus.markdown
index 3c4355584aa..ecbd346ff6f 100644
--- a/source/_integrations/modbus.markdown
+++ b/source/_integrations/modbus.markdown
@@ -355,8 +355,8 @@ name:
 scan_interval:
   description: "Update interval in seconds.
   scan_interval = 0 for no polling.
-  Entities are unavailable until the first scan interval is passed,
-  except for entities with scan_interval = 0, which are read at startup and not updated."
+  Entities are read shortly after startup and then according to scan_interval.
+  Remark, when restarting HA the last known value is restored."
   required: false
   type: integer
   default: 15