diff --git a/docs/developers.md b/docs/developers.md
index 2bc2f71e..cae5e58e 100644
--- a/docs/developers.md
+++ b/docs/developers.md
@@ -74,6 +74,10 @@ fn test_simple_fraction() {
 }
 ```
 
+## Helpful Links
+
+* [MathCAT Demo]([https://www.mathjax.org/#demo](https://daisy.github.io/MathCATDemo/)): lets you paste a MathML fragment and inspect its displayed math, speech and braille.
+
 ### Test Coverage
 
 Test coverage helps identify which parts of the code are exercised by tests and which parts need more testing.
@@ -121,4 +125,4 @@ open target/coverage/html/index.html
 
 **Alternative: IDE Integration**
 
-Many Rust IDEs provide built-in test coverage support, like RustRover or VSCode.
\ No newline at end of file
+Many Rust IDEs provide built-in test coverage support, like RustRover or VSCode.