diff --git a/progress.md b/progress.md
index cbb83f1..8576ebc 100644
--- a/progress.md
+++ b/progress.md
@@ -107,7 +107,7 @@
  - [x] 12.3 Display, a Recursive Value Printer
  - [x] 12.4 Example: Encoding S-Expressions
  - [x] 12.5 Setting Variables with reflect.Value
- - [ ] 12.6 Example: Decoding S-Expressions
+ - [x] 12.6 Example: Decoding S-Expressions
  - [ ] 12.7 Accessing Struct Field Tags
  - [x] 12.8 Displaying the Methods of a Type
  - [x] 12.9 A Word of Caution