diff --git a/sources b/sources
index e69de29..ee3124d 100644
--- a/sources
+++ b/sources
@@ -0,0 +1 @@
+SHA512 (geos-3.10.1.tar.bz2) = 1ba3af5e07bad40bae584b24ed7750a96f2974b974fbc7ccbaaa756fa6d98ed2ef6c0346e122c9c140307164084c436708bdaec86c0469f665cb1a19d0bdd0c9