diff --git a/doc/example-packet-drv.c b/doc/example-packet-drv.c
index 9ac01a6cd..dd255efeb 100644
--- a/doc/example-packet-drv.c
+++ b/doc/example-packet-drv.c
@@ -35,7 +35,7 @@ example_packet_driver_output(void)
   let_the_hardware_send_the_packet(uip_buf, uip_len);
 
   /*
-   * An network device driver returns always zero.
+   * A network device driver returns always zero.
    */
   return 0;
 }