diff --git a/book-radn b/book-radn
index c33989e..343baf1 160000
--- a/book-radn
+++ b/book-radn
@@ -1 +1 @@
-Subproject commit c33989ee8688d3dc1cba629069be4ee2ba6d3793
+Subproject commit 343baf150fe86ad6cd3594828068d42e7bc25b18
diff --git a/src/core.rs b/src/core.rs
index 9bef2ff..6cfd8f5 100644
--- a/src/core.rs
+++ b/src/core.rs
@@ -4,6 +4,7 @@
 
 mod addresses;
 mod hashing;
+mod points;
 mod resolution;
 mod resolver_origin;
 mod serialization;
diff --git a/src/core/points.rs b/src/core/points.rs
new file mode 100644
index 0000000..39cc068
--- /dev/null
+++ b/src/core/points.rs
@@ -0,0 +1,5 @@
+use super::*;
+
+pub trait TakesPoints<'a, Ctx: 'a + Context> {
+    fn take<A: Mentionable<'a, Ctx>>(&mut self, point: Point<'a, Ctx, A>);
+}