diff --git a/README.md b/README.md
index dc24228..0c806b8 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Each article directory contains three subdirectories:
 ![alt](img/Snake_Apple.jpg)
 * ☑ [I. Mach-O](https://karol-mazurek95.medium.com/snake-apple-i-mach-o-a8eda4b87263?sk=v2%2Ffc1cbfa4-e2d4-4387-9a82-b27191978b5b)
 * ☑ [II. Code Signing](https://karol-mazurek95.medium.com/snake-apple-ii-code-signing-f0a9967b7f02?sk=v2%2Fbbc87007-89ca-4135-91d6-668b5d2fe9ae)
-* ☐ [III. Checksec]()
+* ☑ [III. Checksec](https://karol-mazurek95.medium.com/snake-apple-iii-checksec-ed64a4b766c1?sk=v2%2Fb4b8d637-e906-4b6b-8088-ca1f893cd787)
 * ☐ [IV. Dylibs]()
 
 ## TOOLS