diff --git a/src/attributes/codegen.md b/src/attributes/codegen.md
index c34b5155e..06bb1ec47 100644
--- a/src/attributes/codegen.md
+++ b/src/attributes/codegen.md
@@ -80,6 +80,7 @@ functions][unsafe function].
 
 Feature     | Implicitly Enables | Description
 ------------|--------------------|-------------------
+`adx`       |          | [ADX] — Multi-Precision Add-Carry Instruction Extensions
 `aes`       | `sse2`   | [AES] — Advanced Encryption Standard
 `avx`       | `sse4.2` | [AVX] — Advanced Vector Extensions
 `avx2`      | `avx`    | [AVX2] — Advanced Vector Extensions 2
@@ -106,6 +107,7 @@ Feature     | Implicitly Enables | Description
 
 <!-- Keep links near each table to make it easier to move and update. -->
 
+[ADX]: https://en.wikipedia.org/wiki/Intel_ADX
 [AES]: https://en.wikipedia.org/wiki/AES_instruction_set
 [AVX]: https://en.wikipedia.org/wiki/Advanced_Vector_Extensions
 [AVX2]: https://en.wikipedia.org/wiki/Advanced_Vector_Extensions#AVX2