diff --git a/src/concurrency/thread/threadpool-fractal.md b/src/concurrency/thread/threadpool-fractal.md
index 3bb893d..5a7807e 100644
--- a/src/concurrency/thread/threadpool-fractal.md
+++ b/src/concurrency/thread/threadpool-fractal.md
@@ -27,6 +27,7 @@ use image::{ImageBuffer, Pixel, Rgb};
 #     foreign_links {
 #         MpscRecv(RecvError);
 #         Io(std::io::Error);
+#         Image(image::ImageError);
 #     }
 # }
 #