diff --git a/net/core/dev.c b/net/core/dev.c
index 43c74cad25bc..b9bcbe77d913 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6445,6 +6445,7 @@ EXPORT_SYMBOL(dev_get_phys_port_id);
  *	dev_get_phys_port_name - Get device physical port name
  *	@dev: device
  *	@name: port name
+ *	@len: limit of bytes to copy to name
  *
  *	Get device physical port name
  */