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diff --git a/Links.md b/Links.md
index 68a7624..8599637 100644
--- a/Links.md
+++ b/Links.md
@@ -6,6 +6,7 @@ Utilities
 
 - [Polished Map](https://github.com/Rangi42/polished-map) - FLTK-based map editor.
 - [Crowdmap](https://github.com/yenatch/crowdmap) - Javascript-based map editor.
+- [free_space.awk](https://github.com/Rangi42/pokecrystal/blob/freespace/tools/free_space.awk) - Calculates available space in the ROM.
 
 Documents
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