diff --git a/lib/includes/nghttp2/nghttp2.h b/lib/includes/nghttp2/nghttp2.h
index cbdc9729..1cd68179 100644
--- a/lib/includes/nghttp2/nghttp2.h
+++ b/lib/includes/nghttp2/nghttp2.h
@@ -3608,8 +3608,8 @@ nghttp2_submit_response(nghttp2_session *session, int32_t stream_id,
  *
  * The |nva| is an array of name/value pair :type:`nghttp2_nv` with
  * |nvlen| elements.  The application is responsible not to include
- * required pseudo-header fields (header field whose name starts with
- * ":") in |nva|.
+ * pseudo-header fields (header field whose name starts with ":") in
+ * |nva|.
  *
  * This function creates copies of all name/value pairs in |nva|.  It
  * also lower-cases all names in |nva|.  The order of elements in
@@ -3624,20 +3624,20 @@ nghttp2_submit_response(nghttp2_session *session, int32_t stream_id,
  * :type:`nghttp2_on_frame_not_send_callback` is called.
  *
  * For server, trailer fields must follow response HEADERS or response
- * DATA with END_STREAM flag set.  The library does not enforce this
- * requirement, and applications should do this for themselves.  If
- * `nghttp2_submit_trailer()` is called before any response HEADERS
+ * DATA without END_STREAM flat set.  The library does not enforce
+ * this requirement, and applications should do this for themselves.
+ * If `nghttp2_submit_trailer()` is called before any response HEADERS
  * submission (usually by `nghttp2_submit_response()`), the content of
  * |nva| will be sent as response headers, which will result in error.
  *
  * This function has the same effect with `nghttp2_submit_headers()`,
- * with flags = :enum:`NGHTTP2_FLAG_END_HEADERS` and both pri_spec and
+ * with flags = :enum:`NGHTTP2_FLAG_END_STREAM` and both pri_spec and
  * stream_user_data to NULL.
  *
  * To submit trailer fields after `nghttp2_submit_response()` is
  * called, the application has to specify
- * :type:`nghttp2_data_provider` to `nghttp2_submit_response()`.  In
- * side :type:`nghttp2_data_source_read_callback`, when setting
+ * :type:`nghttp2_data_provider` to `nghttp2_submit_response()`.
+ * Inside of :type:`nghttp2_data_source_read_callback`, when setting
  * :enum:`NGHTTP2_DATA_FLAG_EOF`, also set
  * :enum:`NGHTTP2_DATA_FLAG_NO_END_STREAM`.  After that, the
  * application can send trailer fields using