diff --git a/resources.md b/resources.md
index 1eeb876..9776601 100644
--- a/resources.md
+++ b/resources.md
@@ -27,6 +27,7 @@
 - <https://en.wikipedia.org/wiki/Video_Graphics_Array>
 - <https://os.phil-opp.com/vga-text-mode/>
 - <https://mendelson.org/wpdos/videomodes.txt>
+- <https://en.wikipedia.org/wiki/Code_page_437>
 
 ## ELF
 - <https://wiki.osdev.org/ELF>