diff --git a/tools/README.txt b/tools/README.txt
index c693f7135a9..5ac5db36f82 100644
--- a/tools/README.txt
+++ b/tools/README.txt
@@ -908,6 +908,8 @@ simbridge.sh
      $ tools/simbridge.sh
      Usage: tools/simbridge.sh <interface> <on|off>
 
+  See boards/sim/sim/sim/NETWORK-LINUX.txt for further information
+
 showsize.sh
 -----------