diff --git a/Resources:-spread-functions.md b/Resources:-spread-functions.md
index bba7cc0..5f330e7 100644
--- a/Resources:-spread-functions.md
+++ b/Resources:-spread-functions.md
@@ -18,6 +18,12 @@ Build-in functions make models syntax easier to read:
 * `nth(number)`: true for each nth cell only, e.g. `nth(2)` skips 50% of cells, `nth(5)` skips 80% of cells
 * `random(number)`: percentage of true, e.g. `50` will return true in 50% of cases 
 
+Let's say we want a resource to be generated in hot and highly elevated areas. If altitude is medium, let it also be allowed, but pretty rarely. The model will be something like `minTemp(15) && (minHeight(70) || minHeight(40) && nth(5))`.
+
+-----
+const fn = new Function("i", "minTemp(15) && (minHeight(70) || minHeight(40) && nth(5))");
+fn(i);
+
 Default biome ids:
 * 0: Marine
 * 1: Hot desert