Add zulip link

content/_index.md

@@ -7,8 +7,9 @@ The Calyx compiler automatically optimizes and lowers programs into
 synthesizable hardware designs.
 Calyx has been integrated with the [LLVM CIRCT infrastructure][circt] and is available as a [dialect][calyx-circt] within it.
 
-If you're interested in building on Calyx, please [say hello][intro] and let's chat!
+If you're interested in building on Calyx, please [join our Zulip chat][zulip] or [start a discussion][intro] and let's chat!
 
 [intro]: https://github.com/cucapra/calyx/discussions/new?category=introductions
 [circt]: https://github.com/llvm/circt/
 [calyx-circt]: https://circt.llvm.org/docs/Dialects/Calyx/
+[zulip]: https://calyx.zulipchat.com/