diff --git a/src/include/lwip/apps/httpd_opts.h b/src/include/lwip/apps/httpd_opts.h
index 98198ce3..86cb1f1d 100644
--- a/src/include/lwip/apps/httpd_opts.h
+++ b/src/include/lwip/apps/httpd_opts.h
@@ -271,7 +271,8 @@
 #endif
 
 /* Define this to a function that returns the maximum amount of data to enqueue.
-   The function have this signature: u16_t fn(struct tcp_pcb* pcb); */
+   The function have this signature: u16_t fn(struct altcp_pcb* pcb);
+   The best place to define this is the hooks file (@see LWIP_HOOK_FILENAME) */
 #if !defined HTTPD_MAX_WRITE_LEN || defined __DOXYGEN__
 #if HTTPD_LIMIT_SENDING_TO_2MSS
 #define HTTPD_MAX_WRITE_LEN(pcb)    (2 * altcp_mss(pcb))