diff --git a/README.md b/README.md
index 2c98ac8..09077c3 100644
--- a/README.md
+++ b/README.md
@@ -8,5 +8,5 @@ https://discord.gg/cave-of-linguists
 The challenges feature:
 
 - [BeepBoopBook](BeepBoopBook/) (C++): usage of the ternary operator.
-- [CodingChallenge0](CodingChallenge0) (POSIX shell): POSIX-compliant (almost entirely, has a *for* loop) naïve implementation of primality test with a few simple optimizations.
-- [CodingChallenge1](CodingChallenge1) (Qt C++): production-grade encapsulation, documentation, internationalization and a fancy GUI available in 3 languages.
+- [CodingChallenge0](CodingChallenge0/) (POSIX shell): POSIX-compliant (almost entirely, has a *for* loop) naïve implementation of primality test with a few simple optimizations.
+- [CodingChallenge1](CodingChallenge1/) (Qt C++): production-grade encapsulation, documentation (doxygen: [link](https://greentaily.github.io/col-challenges/index.html)), internationalization and a fancy GUI available in 3 languages.