diff --git a/netpfga/minip4/nf_sume_sdnet_ip/README b/netpfga/minip4/nf_sume_sdnet_ip/README
new file mode 100644
index 0000000..7927685
--- /dev/null
+++ b/netpfga/minip4/nf_sume_sdnet_ip/README
@@ -0,0 +1,2 @@
+This directory and all its content are copied from switch_calc
+from git@github.com:NetFPGA/P4-NetFPGA-live.git