diff --git a/progress.md b/progress.md
index 2bb4bf1..fee5f7a 100644
--- a/progress.md
+++ b/progress.md
@@ -84,7 +84,7 @@
  - [x] 9.4 Memory Synchronization
  - [x] 9.5 Lazy Initialization: sync.Once
  - [x] 9.6 The Race Detector
- - [ ] 9.7 Example: Concurrent Non-Blocking Cache
+ - [x] 9.7 Example: Concurrent Non-Blocking Cache
  - [x] 9.8 Goroutines and Threads
 - [x] Chapter 10: Packages and the Go Tool
  - [x] 10.1 Introduction