1 files changed, 5 insertions, 2 deletions
diff --git a/src/step.rs b/src/step.rs
index 7010bd9..35d4328 100644
--- a/src/step.rs
+++ b/src/step.rs
@@ -1,7 +1,10 @@
-use crate::ctx::Ctx;
+use crate::ctx::{Ctx, Approx};
 use crate::quad::{Node, Embed};
 
-pub fn step<A: Embed, B: Embed>(ctx: &mut Ctx<A, B>, node: Node<A, B>) -> Node<A, B> {
+pub fn step<A: Embed, B: Embed, S, N: Approx<A, B, S>>(
+    ctx: &mut Ctx<A, B, S, N>,
+    node: Node<A, B>
+) -> Node<A, B> {
     // pad the graph if needed.
 
     // if we're at the base, run the cellular automation rule: