diff --git a/progress.md b/progress.md
index a0808bd..2062437 100644
--- a/progress.md
+++ b/progress.md
@@ -102,7 +102,7 @@
  - [x] 11.5 Profiling
  - [x] 11.6 Example Functions
 - [x] Chapter 12: Reflection
- - [ ] 12.1 Why Reflection?
+ - [x] 12.1 Why Reflection?
  - [ ] 12.2 reflect.Type and reflect.Value
  - [ ] 12.3 Display, a Recursive Value Printer
  - [ ] 12.4 Example: Encoding S-Expressions