diff --git a/lib/nghttp2_session.h b/lib/nghttp2_session.h
index 78af0077..d9c193bf 100644
--- a/lib/nghttp2_session.h
+++ b/lib/nghttp2_session.h
@@ -54,16 +54,14 @@ typedef enum {
 
 typedef struct {
   nghttp2_outbound_item *item;
-
   nghttp2_bufs framebufs;
   nghttp2_outbound_state state;
 } nghttp2_active_outbound_item;
 
-/* Buffer length for inbound raw byte stream. */
+/* Buffer length for inbound raw byte stream used in
+   nghttp2_session_recv(). */
 #define NGHTTP2_INBOUND_BUFFER_LENGTH 16384
 
-#define NGHTTP2_INITIAL_NV_BUFFER_LENGTH 4096
-
 /* Internal state when receiving incoming frame */
 typedef enum {
   /* Receiving frame header */