diff --git a/MdePkg/Include/Protocol/Udp4.h b/MdePkg/Include/Protocol/Udp4.h
index 5541f5e692..cc128f5fa9 100644
--- a/MdePkg/Include/Protocol/Udp4.h
+++ b/MdePkg/Include/Protocol/Udp4.h
@@ -170,6 +170,10 @@ EFI_STATUS
                                 RARP, etc.) is not finished yet.
   @retval EFI_INVALID_PARAMETER This is NULL.
   @retval EFI_INVALID_PARAMETER UdpConfigData.StationAddress is not a valid unicast IPv4 address.
+  @retval EFI_INVALID_PARAMETER UdpConfigData.SubnetMask is not a valid IPv4 address mask. The subnet
+                                mask must be contiguous.
+  @retval EFI_INVALID_PARAMETER UdpConfigData.RemoteAddress is not a valid unicast IPv4 address if it
+                                is not zero.
   @retval EFI_ALREADY_STARTED   The EFI UDPv4 Protocol instance is already started/configured
                                 and must be stopped/reset before it can be reconfigured.
   @retval EFI_ACCESS_DENIED     UdpConfigData. AllowDuplicatePort is FALSE
@@ -320,7 +324,8 @@ EFI_STATUS
   @retval EFI_NO_MAPPING        When using a default address, configuration (DHCP, BOOTP, RARP, etc.)
                                 is not finished yet.
   @retval EFI_INVALID_PARAMETER This is NULL.
-  @retval EFI_INVALID_PARAMETER UdpConfigData.StationAddress is not a valid unicast IPv4 address.
+  @retval EFI_INVALID_PARAMETER Token is NULL.
+  @retval EFI_INVALID_PARAMETER Token.Event is NULL.
   @retval EFI_OUT_OF_RESOURCES  The receive completion token could not be queued due to a lack of system
                                 resources (usually memory).
   @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred.