diff --git a/README.md b/README.md
index 095a8e00..05a32c41 100644
--- a/README.md
+++ b/README.md
@@ -248,7 +248,8 @@ and then inspect the logs.
 (NB. This is only necessary if you want to work on weave. Also, these
 instructions have only been tested on Ubuntu.)
 
-To build weave you need `libpcap-dev` and `docker` installed.
+To build weave you need `libpcap-dev` and `docker` installed. And
+`go`.
 
 Then simply run