diff --git a/progress.md b/progress.md
index 6865898..da134f4 100644
--- a/progress.md
+++ b/progress.md
@@ -117,4 +117,4 @@
  - [x] 13.3 Example: Deep Equivalence
  - [x] 13.4 Calling C Code with cgo
  - [x] 13.5 Another Word of Caution
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