doxygen: add a link to src-ref on mainpage.md.

Closes 34246.

diff --git a/src/mainpage.md b/src/mainpage.md
index 8a73578819f2c2a40c3786dfc0dfbaa6489ccdc8..2c4c494354268efaa94db368cc27a0541fd34e7c 100644 (file)
--- a/src/mainpage.md
+++ b/src/mainpage.md
@@ -4,6 +4,9 @@
 
 @section welcome Welcome to Tor
 
+(For an up-to-date rendered copy of this documentation, see
+https://src-ref.docs.torproject.org/tor/index.html .)
+
 This documentation describes the general structure of the Tor codebase, how
 it fits together, what functionality is available for extending Tor, and
 gives some notes on how Tor got that way.  It also includes a reference for