diff --git a/doc/plan.org b/doc/plan.org
index 18cfe35..b6aa250 100644
--- a/doc/plan.org
+++ b/doc/plan.org
@@ -8836,8 +8836,8 @@ printf %0500d\\n 42 | socat - UDP:10.0.0.66:2345
 
 
 #+END_CENTER
-**** TODO Netpfga: analysing wireguard
-     - Content changes
+**** TODO Netpfga: analysing wireshark
+     - Content / payload changes
 
 
 ** The NetPFGA saga
diff --git a/p4src/minip4_solution.p4 b/p4src/minip4_solution.p4
index 3db4d37..25d1d53 100644
--- a/p4src/minip4_solution.p4
+++ b/p4src/minip4_solution.p4
@@ -6,6 +6,9 @@
 #define Parsed_packet headers
 #define user_metadata_t metadata
 
+// 1500 mtu * 8 = 12000
+#define MAX_NETPFGA_PACKET_SIZE_BITS 12000
+
 // digest_data, MUST be 256 bits -- not using it
 struct digest_data_t {
     bit<256> unused;
@@ -25,7 +28,7 @@ parser RealParser(
     #include "parsers.p4"
 }
 
-@Xilinx_MaxPacketRegion(1024)
+@Xilinx_MaxPacketRegion(MAX_NETPFGA_PACKET_SIZE_BITS)
 parser TopParser(
     packet_in b,
     out Parsed_packet p,
@@ -99,7 +102,7 @@ control RealDeParser(
     #include "deparser.p4"
 }
 
-@Xilinx_MaxPacketRegion(1024)
+@Xilinx_MaxPacketRegion(MAX_NETPFGA_PACKET_SIZE_BITS)
 control TopDeparser(
     packet_out b,
     in Parsed_packet p,