diff --git a/lib/includes/nghttp2/nghttp2.h b/lib/includes/nghttp2/nghttp2.h
index 9bf1cadb..0fff133f 100644
--- a/lib/includes/nghttp2/nghttp2.h
+++ b/lib/includes/nghttp2/nghttp2.h
@@ -449,27 +449,30 @@ typedef struct {
  * @enum
  *
  * The category of HEADERS, which indicates the role of the frame. In
- * HTTP/2.0 spec, request HEADERS and response HEADERS and other
- * arbitrary sent HEADERS are all called just HEADERS. In SPDY days,
- * they are called as SYN_STREAM, SYN_REPLY and HEADERS and which is
- * self-explanatory and easy to code. To give the application the
- * particular HEADERS frame is analogous to the SPDY terms, we define
- * 3 categories for it.
+ * HTTP/2.0 spec, request, response, push response and other arbitrary
+ * headers (e.g., trailers) are all called just HEADERS. To give the
+ * application the role of incoming HEADERS frame, we define several
+ * categories.
  */
 typedef enum {
   /**
-   * The HEADERS frame is opening stream, which is analogous to SPDY
-   * SYN_STREAM.
+   * The HEADERS frame is opening new stream, which is analogous to
+   * SYN_STREAM in SPDY.
    */
-  NGHTTP2_HCAT_START_STREAM,
+  NGHTTP2_HCAT_REQUEST,
   /**
    * The HEADERS frame is the first response headers, which is
-   * analogous to SPDY SYN_REPLY.
+   * analogous to SYN_REPLY in SPDY.
    */
-  NGHTTP2_HCAT_REPLY,
+  NGHTTP2_HCAT_RESPONSE,
+  /**
+   * The HEADERS frame is the first headers sent against reserved
+   * stream.
+   */
+  NGHTTP2_HCAT_PUSH_RESPONSE,
   /**
    * The HEADERS frame which does not apply for the above categories,
-   * which is analogous to SPDY HEADERS.
+   * which is analogous to HEADERS in SPDY.
    */
   NGHTTP2_HCAT_HEADERS,
 } nghttp2_headers_category;
diff --git a/lib/nghttp2_frame.c b/lib/nghttp2_frame.c
index 306063c3..f98ad59d 100644
--- a/lib/nghttp2_frame.c
+++ b/lib/nghttp2_frame.c
@@ -203,7 +203,7 @@ void nghttp2_frame_headers_init(nghttp2_headers *frame,
   frame->pri = pri;
   frame->nva = nva;
   frame->nvlen = nvlen;
-  frame->cat = NGHTTP2_HCAT_START_STREAM;
+  frame->cat = NGHTTP2_HCAT_REQUEST;
 }
 
 void nghttp2_frame_headers_free(nghttp2_headers *frame)
diff --git a/lib/nghttp2_session.c b/lib/nghttp2_session.c
index 7ad532af..241c7cd4 100644
--- a/lib/nghttp2_session.c
+++ b/lib/nghttp2_session.c
@@ -902,11 +902,10 @@ static ssize_t nghttp2_session_prep_frame(nghttp2_session *session,
     frame = nghttp2_outbound_item_get_ctrl_frame(item);
     switch(frame->hd.type) {
     case NGHTTP2_HEADERS: {
-      int push_reply = 0;
       if(frame->hd.stream_id == -1) {
         /* initial HEADERS, which opens stream */
         int r;
-        frame->headers.cat = NGHTTP2_HCAT_START_STREAM;
+        frame->headers.cat = NGHTTP2_HCAT_REQUEST;
         r = nghttp2_session_predicate_syn_stream_send(session,
                                                       &frame->headers);
         if(r != 0) {
@@ -916,13 +915,10 @@ static ssize_t nghttp2_session_prep_frame(nghttp2_session *session,
         session->next_stream_id += 2;
       } else if(nghttp2_session_predicate_push_reply_send
                 (session, frame->hd.stream_id) == 0) {
-        /* HEADERS against promised stream */
-        push_reply = 1;
-        frame->headers.cat = NGHTTP2_HCAT_REPLY;
+        frame->headers.cat = NGHTTP2_HCAT_PUSH_RESPONSE;
       } else if(nghttp2_session_predicate_syn_reply_send
                 (session, frame->hd.stream_id) == 0) {
-        /* first response HEADERS */
-        frame->headers.cat = NGHTTP2_HCAT_REPLY;
+        frame->headers.cat = NGHTTP2_HCAT_RESPONSE;
       } else {
         int r;
         frame->headers.cat = NGHTTP2_HCAT_HEADERS;
@@ -940,7 +936,8 @@ static ssize_t nghttp2_session_prep_frame(nghttp2_session *session,
       if(framebuflen < 0) {
         return framebuflen;
       }
-      if(frame->headers.cat == NGHTTP2_HCAT_START_STREAM) {
+      switch(frame->headers.cat) {
+      case NGHTTP2_HCAT_REQUEST: {
         nghttp2_headers_aux_data *aux_data;
         aux_data = (nghttp2_headers_aux_data*)item->aux_data;
         if(nghttp2_session_open_stream
@@ -951,7 +948,9 @@ static ssize_t nghttp2_session_prep_frame(nghttp2_session *session,
             aux_data ? aux_data->stream_user_data : NULL) == NULL) {
           return NGHTTP2_ERR_NOMEM;
         }
-      } else if(push_reply) {
+        break;
+      }
+      case NGHTTP2_HCAT_PUSH_RESPONSE: {
         nghttp2_headers_aux_data *aux_data;
         aux_data = (nghttp2_headers_aux_data*)item->aux_data;
         if(aux_data) {
@@ -959,6 +958,10 @@ static ssize_t nghttp2_session_prep_frame(nghttp2_session *session,
           stream = nghttp2_session_get_stream(session, frame->hd.stream_id);
           stream->stream_user_data = aux_data->stream_user_data;
         }
+        break;
+      }
+      default:
+        break;
       }
       break;
     }
@@ -1241,7 +1244,7 @@ static int nghttp2_session_after_frame_sent(nghttp2_session *session)
       nghttp2_headers_aux_data *aux_data;
       if(stream) {
         switch(frame->headers.cat) {
-        case NGHTTP2_HCAT_START_STREAM: {
+        case NGHTTP2_HCAT_REQUEST: {
           stream->state = NGHTTP2_STREAM_OPENING;
           if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
             nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_WR);
@@ -1263,7 +1266,8 @@ static int nghttp2_session_after_frame_sent(nghttp2_session *session)
           }
           break;
         }
-        case NGHTTP2_HCAT_REPLY:
+        case NGHTTP2_HCAT_RESPONSE:
+        case NGHTTP2_HCAT_PUSH_RESPONSE:
           stream->state = NGHTTP2_STREAM_OPENED;
           if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
             nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_WR);
@@ -1583,7 +1587,7 @@ static int nghttp2_session_is_new_peer_stream_id(nghttp2_session *session,
 
 /*
  * Validates received HEADERS frame |frame| with
- * NGHTTP2_HCAT_START_STREAM category_. This function returns 0 if it
+ * NGHTTP2_HCAT_REQUEST category_. This function returns 0 if it
  * succeeds, or non-zero nghttp2_error_code.
  */
 static int nghttp2_session_validate_syn_stream(nghttp2_session *session,
@@ -2270,7 +2274,7 @@ static int nghttp2_session_process_ctrl_frame(nghttp2_session *session)
       if(stream) {
         if(nghttp2_session_is_my_stream_id(session, frame.hd.stream_id)) {
           if(stream->state == NGHTTP2_STREAM_OPENING) {
-            frame.headers.cat = NGHTTP2_HCAT_REPLY;
+            frame.headers.cat = NGHTTP2_HCAT_RESPONSE;
             r = nghttp2_session_on_syn_reply_received(session, &frame, stream);
           } else {
             frame.headers.cat = NGHTTP2_HCAT_HEADERS;
@@ -2278,14 +2282,14 @@ static int nghttp2_session_process_ctrl_frame(nghttp2_session *session)
           }
         } else if(!session->server &&
                   stream->state == NGHTTP2_STREAM_RESERVED) {
-          frame.headers.cat = NGHTTP2_HCAT_REPLY;
+          frame.headers.cat = NGHTTP2_HCAT_PUSH_RESPONSE;
           r = nghttp2_session_on_push_reply_received(session, &frame, stream);
         } else {
           frame.headers.cat = NGHTTP2_HCAT_HEADERS;
           r = nghttp2_session_on_headers_received(session, &frame, stream);
         }
       } else {
-        frame.headers.cat = NGHTTP2_HCAT_START_STREAM;
+        frame.headers.cat = NGHTTP2_HCAT_REQUEST;
         r = nghttp2_session_on_syn_stream_received(session, &frame);
       }
       nghttp2_frame_headers_free(&frame.headers);
diff --git a/src/HttpServer.cc b/src/HttpServer.cc
index 3bcef6a9..996e3d81 100644
--- a/src/HttpServer.cc
+++ b/src/HttpServer.cc
@@ -687,7 +687,7 @@ void hd_on_frame_recv_callback
   switch(frame->hd.type) {
   case NGHTTP2_HEADERS:
     switch(frame->headers.cat) {
-    case NGHTTP2_HCAT_START_STREAM: {
+    case NGHTTP2_HCAT_REQUEST: {
       int32_t stream_id = frame->hd.stream_id;
       auto req = util::make_unique<Request>(stream_id);
       append_nv(req.get(), frame->headers.nva, frame->headers.nvlen);
diff --git a/src/app_helper.cc b/src/app_helper.cc
index 2b956e56..7dbe4de6 100644
--- a/src/app_helper.cc
+++ b/src/app_helper.cc
@@ -229,14 +229,18 @@ void print_frame(print_type ptype, nghttp2_frame *frame)
       printf("(pri=%d)\n", frame->headers.pri);
     }
     switch(frame->headers.cat) {
-    case NGHTTP2_HCAT_START_STREAM:
+    case NGHTTP2_HCAT_REQUEST:
       print_frame_attr_indent();
       printf("; Open new stream\n");
       break;
-    case NGHTTP2_HCAT_REPLY:
+    case NGHTTP2_HCAT_RESPONSE:
       print_frame_attr_indent();
       printf("; First response header\n");
       break;
+    case NGHTTP2_HCAT_PUSH_RESPONSE:
+      print_frame_attr_indent();
+      printf("; First push response header\n");
+      break;
     default:
       break;
     }
diff --git a/src/nghttp.cc b/src/nghttp.cc
index 970703d0..c8410198 100644
--- a/src/nghttp.cc
+++ b/src/nghttp.cc
@@ -745,7 +745,7 @@ void on_frame_send_callback2
 (nghttp2_session *session, nghttp2_frame *frame, void *user_data)
 {
   if(frame->hd.type == NGHTTP2_HEADERS &&
-     frame->headers.cat == NGHTTP2_HCAT_START_STREAM) {
+     frame->headers.cat == NGHTTP2_HCAT_REQUEST) {
     check_stream_id(session, frame, user_data);
   }
   if(config.verbose) {
@@ -757,7 +757,7 @@ void check_response_header
 (nghttp2_session *session, nghttp2_frame *frame, void *user_data)
 {
   if(frame->hd.type != NGHTTP2_HEADERS ||
-     frame->headers.cat != NGHTTP2_HCAT_REPLY) {
+     frame->headers.cat != NGHTTP2_HCAT_RESPONSE) {
     return;
   }
   auto req = (Request*)nghttp2_session_get_stream_user_data
@@ -792,7 +792,7 @@ void on_frame_recv_callback2
 (nghttp2_session *session, nghttp2_frame *frame, void *user_data)
 {
   if(frame->hd.type == NGHTTP2_HEADERS &&
-     frame->headers.cat == NGHTTP2_HCAT_REPLY) {
+     frame->headers.cat == NGHTTP2_HCAT_RESPONSE) {
     auto req = (Request*)nghttp2_session_get_stream_user_data
       (session, frame->hd.stream_id);
     assert(req);