diff --git a/README.md b/README.md
index 439ff13b..0595f491 100644
--- a/README.md
+++ b/README.md
@@ -50,4 +50,5 @@ _acme4j_ is open source software. The source code is distributed under the terms
 ## Acknowledgements
 
 * I would like to thank Brian Campbell and all the other [jose4j](https://bitbucket.org/b_c/jose4j/wiki/Home) developers. _acme4j_ would not exist without your excellent work.
+* Thanks to [Daniel McCarney](https://github.com/cpu) for his help with the ACME protocol, Pebble, and Boulder.
 * I also like to thank everyone who contributed to _acme4j_.