diff --git a/include/openthread/instance.h b/include/openthread/instance.h
index d7c88e390..5789685a7 100644
--- a/include/openthread/instance.h
+++ b/include/openthread/instance.h
@@ -53,7 +53,7 @@ extern "C" {
  * @note This number versions both OpenThread platform and user APIs.
  *
  */
-#define OPENTHREAD_API_VERSION (285)
+#define OPENTHREAD_API_VERSION (286)
 
 /**
  * @addtogroup api-instance
diff --git a/include/openthread/tcp_ext.h b/include/openthread/tcp_ext.h
index 41c2fb84e..0258ac28b 100644
--- a/include/openthread/tcp_ext.h
+++ b/include/openthread/tcp_ext.h
@@ -240,7 +240,7 @@ int otTcpMbedTlsSslSendCallback(void *aCtx, const unsigned char *aBuf, size_t aL
  *
  * @param[in]   aCtx  A pointer to an otTcpEndpointAndCircularSendBuffer.
  * @param[out]  aBuf  The buffer into which to receive data.
- * @param[in]   aLen  The maxmimum amount of data that can be received.
+ * @param[in]   aLen  The maximum amount of data that can be received.
  *
  * @returns The number of bytes received, or an mbedtls error code.
  */