diff --git a/src/core/raw.c b/src/core/raw.c
index e024410e..efa21f90 100644
--- a/src/core/raw.c
+++ b/src/core/raw.c
@@ -271,7 +271,7 @@ raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg)
  * then.)
  *
  * @param pcb the raw pcb which to send
- * @param p the IP payload to send. pbuf layer must be @ref PBUF_IP.
+ * @param p the IP payload to send
  * @param ipaddr the destination address of the IP packet
  *
  */
@@ -393,7 +393,7 @@ raw_sendto(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *ipaddr)
  * Send the raw IP packet to the address given by raw_connect()
  *
  * @param pcb the raw pcb which to send
- * @param p the IP payload to send. pbuf layer must be @ref PBUF_IP.
+ * @param p the IP payload to send
  *
  */
 err_t
diff --git a/src/core/udp.c b/src/core/udp.c
index 050a9364..bb957faf 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -462,7 +462,7 @@ chkerr:
  * Send data using UDP.
  *
  * @param pcb UDP PCB used to send the data.
- * @param p chain of pbuf's to be sent. pbuf layer must be @ref PBUF_TRANSPORT.
+ * @param p chain of pbuf's to be sent.
  *
  * The datagram will be sent to the current remote_ip & remote_port
  * stored in pcb. If the pcb is not bound to a port, it will
@@ -511,7 +511,7 @@ udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
  * Send data to a specified address using UDP.
  *
  * @param pcb UDP PCB used to send the data.
- * @param p chain of pbuf's to be sent. pbuf layer must be @ref PBUF_TRANSPORT.
+ * @param p chain of pbuf's to be sent.
  * @param dst_ip Destination IP address.
  * @param dst_port Destination UDP port.
  *
@@ -598,7 +598,7 @@ udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip,
  * on a netif that is still down.
  *
  * @param pcb UDP PCB used to send the data.
- * @param p chain of pbuf's to be sent. pbuf layer must be @ref PBUF_TRANSPORT.
+ * @param p chain of pbuf's to be sent.
  * @param dst_ip Destination IP address.
  * @param dst_port Destination UDP port.
  * @param netif the netif used for sending.