diff --git a/src/push_solve.rs b/src/push_solve.rs
index 05435c3..c0daa34 100644
--- a/src/push_solve.rs
+++ b/src/push_solve.rs
@@ -1,5 +1,8 @@
 use strafesnet_common::integer::{Planar64,Planar64Vec3};
 
+// This algorithm is based on Lua code
+// written by Trey Reynolds in 2021
+
 // 1/2^10
 const EPSILON:Planar64=Planar64::raw(1<<(32-10));