diff --git a/doc/guides/writing-tests.md b/doc/guides/writing-tests.md
index 7b1d168d85b2ff..b4d05e2811b254 100644
--- a/doc/guides/writing-tests.md
+++ b/doc/guides/writing-tests.md
@@ -424,6 +424,9 @@ will depend on what is being tested if this is required or not.
 To generate a test coverage report, see the
 [Test Coverage section of the Building guide][].
 
+Nightly coverage reports for the Node.js master branch are available at
+https://coverage.nodejs.org/.
+
 [ASCII]: http://man7.org/linux/man-pages/man7/ascii.7.html
 [Google Test]: https://github.com/google/googletest
 [`common` module]: https://github.com/nodejs/node/blob/master/test/common/README.md