diff --git a/README.md b/README.md
index 5da08da..19464ac 100644
--- a/README.md
+++ b/README.md
@@ -18,4 +18,6 @@ all the scripts and binaries are placed in `/data/adb/zerotier/` ， you can use
 
 Note that the zerotier binaries are only build for aarch64, you can build it yourself in termux.
 
-Remember to delete `ZT_SSO_SUPPORTED=1` if you don't want to build zeroidc with rust.
+Remember to delete `ZT_SSO_SUPPORTED=1` in `make-linux.mk` if you don't want to build zeroidc with rust.
+
+Download miniupnpd library from http://miniupnp.free.fr/files/ and configure linking options in `make-linux.mk`