diff --git a/guide/README.md b/guide/README.md
index af405a6..a87e1cd 100644
--- a/guide/README.md
+++ b/guide/README.md
@@ -511,6 +511,9 @@ I'm [felixge](https://github.com/felixge) and work at [Datadog](https://www.data
 
 The information on this page is believed to be correct, but no warranty is provided. Feedback is welcome!
 
+Credits:
+- [Nick Ripley](https://github.com/nsrip-dd) for contributing the [Mutex Profiler](#mutex-profiler) section.
+
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 Notes: