diff --git a/prototype/Doubt/Prism.swift b/prototype/Doubt/Prism.swift
index f9d5ecd78..6d55468ec 100644
--- a/prototype/Doubt/Prism.swift
+++ b/prototype/Doubt/Prism.swift
@@ -1,4 +1,4 @@
-struct Prism<From, To> {
+public struct Prism<From, To> {
 	let forward: From -> To?
 	let backward: To -> From
 }
@@ -9,6 +9,6 @@ extension Dictionary {
 	}
 }
 
-func >>> <From, Part, To> (left: Prism<From, Part>, right: Prism<Part, To>) -> Prism<From, To> {
+public func >>> <From, Part, To> (left: Prism<From, Part>, right: Prism<Part, To>) -> Prism<From, To> {
 	return Prism(forward: { left.forward($0).flatMap(right.forward) }, backward: right.backward >>> left.backward)
 }