diff --git a/2023/day1/README.md b/2023/day1/README.md
index e8a1e5c..fdcd99f 100644
--- a/2023/day1/README.md
+++ b/2023/day1/README.md
@@ -1,9 +1,9 @@
-I completed this one with just shell tools.
+I completed this one with just shell tools (chimerautils).
 
 Day 1:
 
-    zsh day1.zsh ../input/day1.txt
+    sh day1.sh ../input/day1.txt
 
 Day 2:
 
-    zsh day1.2.zsh ../input/day1.txt
+    sh day1.2.sh ../input/day1.txt