diff --git a/readme.md b/readme.md
index b0f1f80b..2f471415 100644
--- a/readme.md
+++ b/readme.md
@@ -581,6 +581,7 @@
 - [inspectIT](https://github.com/inspectit-labs/awesome-inspectit#readme) - Open source Java app performance management tool.
 - [Open Source Maintainers](https://github.com/nayafia/awesome-maintainers#readme) - The experience of being an open source maintainer.
 - [Calculators](https://github.com/xxczaki/awesome-calculators#readme) - Calculators for every platform.
+- [Captcha](https://github.com/ZYSzys/awesome-captcha#readme) - A type of challenge–response test used in computing to determine whether or not the user is human.
 
 
 ## License