diff --git a/exercises/070_comptime5.zig b/exercises/070_comptime5.zig
index 7934326..89367bd 100644
--- a/exercises/070_comptime5.zig
+++ b/exercises/070_comptime5.zig
@@ -52,6 +52,12 @@ const RubberDuck = struct {
     fn quack(self: RubberDuck) void {
         print("\"Squeek!\" ", .{});
     }
+
+    fn listen(self: RubberDuck, dev_talk: []const u8) void {
+        // Listen to developer talk about programming problem.
+        // Silently contemplate problem. Emit helpful sound.
+        self.quack();
+    }
 };
 
 const Duct = struct {
diff --git a/patches/patches/070_comptime5.patch b/patches/patches/070_comptime5.patch
index 1c56719..394d9f1 100644
--- a/patches/patches/070_comptime5.patch
+++ b/patches/patches/070_comptime5.patch
@@ -1,4 +1,4 @@
-116,117c116,117
+122,123c122,123
 <     const walks_like_duck = ???;
 <     const quacks_like_duck = ???;
 ---