diff --git a/README.html b/README.html
index f74c031..6ace201 100644
--- a/README.html
+++ b/README.html
@@ -174,6 +174,10 @@ library binary version to use.</p>
 example application that processes WAV audio files using SoundTouch library in 
 Android devices.</p>
 
+<h3>2.4. Building in Mac</h3>
+<p>Install autoconf tool as instructed in <a href="http://macappstore.org/autoconf/">http://macappstore.org/autoconf/</a>.</p> 
+<p>Then, build as described above in section "Building in Gnu platforms".</p>
+
 <hr>
 <h2>3. About implementation &amp; Usage tips <h3>3.1. Supported sample data formats</h3>
 <p>The sample data format can be chosen between 16bit signed integer
@@ -928,6 +932,6 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</p>
 <p>---</p>
 <p>commercial license alternative also available, contact author for details.</p>
 <hr>
-<p><i>README.html file updated in January-2019</i></p>
+<p><i>README.html file updated in October-2019</i></p>
 </body>
 </html>