diff --git a/README.md b/README.md
index b85f3073..189c88cf 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,8 @@ For instance, by adding the following lines to `~/.bashrc`
           make -j1 daemon simplewallet
 
       **NOTICE**: If you are building on a machine with a relatively high amount of RAM or with the proper setting of virtual memory, then you can use `-j2` or `-j` option to speed up the building process. Use with caution.
+      
+      **NOTICE 2**: If you'd like to build binaries for the testnet, use `cmake -D TESTNET=TRUE ..` instead of `cmake ..` .
    
    1. Building GUI: