diff --git a/doc/constraints/ulx3s_v20.lpf b/doc/constraints/ulx3s_v20.lpf
index 2896cac..a07fab0 100644
--- a/doc/constraints/ulx3s_v20.lpf
+++ b/doc/constraints/ulx3s_v20.lpf
@@ -179,6 +179,7 @@ IOBUF PORT "wifi_en" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;
 IOBUF PORT "wifi_rxd" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;
 IOBUF PORT "wifi_txd" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;
 IOBUF PORT "wifi_gpio0" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;
+IOBUF PORT "wifi_gpio5" PULLMODE=NONE IO_TYPE=LVCMOS33 DRIVE=4;
 IOBUF PORT "wifi_gpio16" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;
 IOBUF PORT "wifi_gpio17" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;
 # IOBUF PORT "prog_done" PULLMODE=UP IO_TYPE=LVCMOS33 DRIVE=4;