chore: add reference

spider-gazelle · Jul 27, 2024 · c935b73 · c935b73
1 parent 9e5e5fb
commit c935b73
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/README.md b/README.md
@@ -42,3 +42,7 @@ cells = S2Cells.in(p1, p2) # => Array(CellId)
 # then can search your index:
 # loc_index = ANY(cells.map(&.id))
 ```
+
+## Reference
+
+a crystal clone of https://github.com/sidewalklabs/s2sphere