diff --git a/docs/c-api/coap.h/mg_coap_send_ack.md b/docs/c-api/coap.h/mg_coap_send_ack.md
index 5cdd0c1d..1475a9c5 100644
--- a/docs/c-api/coap.h/mg_coap_send_ack.md
+++ b/docs/c-api/coap.h/mg_coap_send_ack.md
@@ -6,7 +6,7 @@ signature: |
   uint32_t mg_coap_send_ack(struct mg_connection *nc, uint16_t msg_id);
 ---
 
-Compose CoAP acknowledgement from `mg_coap_message`
-and send it into `nc` connection.
+Composes CoAP acknowledgement from `mg_coap_message`
+and sends it into `nc` connection.
 Return value: see `mg_coap_send_message()`