diff --git a/doc/install-source.html b/doc/install-source.html
index b99360c71c..ee579bea35 100644
--- a/doc/install-source.html
+++ b/doc/install-source.html
@@ -176,6 +176,10 @@ architecture, and root directory used during the install.
 <p>
 For more information about ways to control the build, see the discussion of
 <a href="#environment">environment variables</a> below.
+<code>all.bash</code> (or <code>all.bat</code>) runs important tests for Go,
+which can take more time than simply building Go. If you do not want to run
+the test suite use <code>make.bash</code> (or <code>make.bat</code>)
+instead.
 </p>
 </div>