diff --git a/prototype/Doubt/Location.swift b/prototype/Doubt/Location.swift
index ae3a1ac44..b1f49f395 100644
--- a/prototype/Doubt/Location.swift
+++ b/prototype/Doubt/Location.swift
@@ -1,3 +1,4 @@
 public enum Location {
+	/// A literal string, vs. range information.
 	case Literal(String)
 }