diff --git a/src/doc/index.in.html b/src/doc/index.in.html
index e937594a0..ae5ac0a14 100644
--- a/src/doc/index.in.html
+++ b/src/doc/index.in.html
@@ -23,6 +23,10 @@ definition of the language.
 <li>The Boehm-Weiser garbage collector.</li>
 </ul>
 
+<p>ECL supports the operating systems Linux, FreeBSD, NetBSD, Solaris,
+Windows/Cygwin and OSX, running on top of the Intel, Sparc, Alpha and PowerPC
+processors. Porting to other architectures should be rather easy.</p>
+
 <h2>The author</h2>
 
 The original version was written by Giuseppe Attardi.