diff --git a/notes/journal/2024-02-01.md b/notes/journal/2024-02-01.md
index 49417bc..bf3f32a 100644
--- a/notes/journal/2024-02-01.md
+++ b/notes/journal/2024-02-01.md
@@ -15,3 +15,4 @@ title: "2024-02-01"
 * Read 해님 달님 (The Sun and the Moon) from Korean stories.
 * Read sections 11.2 and 13.6 of "Database System Concepts".
 * Practiced [reverse keyboard identification](https://www.musictheory.net/exercises/keyboard-reverse).
+* Spent time learning how Nix's `callpackage` function works.