diff --git a/about.page b/about.page
index 92c3ddd..27f4581 100644
--- a/about.page
+++ b/about.page
@@ -12,9 +12,9 @@
 <h2>Contact</h2>
 
 <p>We'd love to hear from you! Here is how you can communicate with us.</p>
-<p>For sales inquiries, email sales@m-***s.hk. You may also write to Sébastien or Robert respectively at sb@m-***s.hk and rj@m-***s.hk. For questions regarding SolveSpace, write to Peter Zotov at pz@m-***s.hk.</p>
-<p>For technical inquiries, ask on the <a href="https://webchat.freenode.net/?channels=m-labs">IRC channel #m-labs</a> on Freenode, open a GitHub issue in the relevant project, or write to the mailing list <a href="https://ssl.serverraum.org/lists/listinfo/devel">devel</a> (for Migen/MiSoC) or <a href="https://ssl.serverraum.org/lists/listinfo/artiq">ARTIQ</a>.</p>
-<p>Patches should be sent via a GitHub pull request, or to the mailing list preferably using git-format-patch.</p>
+<p>For sales inquiries, email sales@m-***s.hk. You may also write to Sébastien or Robert respectively at sb@m-***s.hk and rj@m-***s.hk. For questions regarding SolveSpace, write to cz@m-***s.hk.</p>
+<p>For technical inquiries, ask on the <a href="https://chat.m-labs.hk/">Mattermost chat room</a> (or the IRC channel #m-labs on Freenode), open an issue in the relevant project, or write to the mailing list <a href="https://ssl.serverraum.org/lists/listinfo/devel">devel</a> (for Migen/MiSoC) or <a href="https://ssl.serverraum.org/lists/listinfo/artiq">ARTIQ</a>.</p>
+<p>Patches should be sent via a pull request.</p>
 
 <p>For the purpose of US government contracts (<u>only</u>), use the following address: 5/F Yat Chau Building, 262 Des Voeux Road Central, Hong Kong.</p>