diff --git a/build/README b/build/README
index a2e1e199..ec1b4186 100644
--- a/build/README
+++ b/build/README
@@ -18,6 +18,8 @@ To build Helma you need a software called Ant. Ant is a build system that was de
 
 To run Ant, you also need JDK 1.3 or higher <http://java.sun.com/j2se/>.
 
+For checking out the source files from Helma's CVS you also need a local installation of a CVS command-line client. More information about CVS: <http://www.cvshome.org/>.
+
 
 STARTING BUILD PROCESSES
 ========================