diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/upgrade-notes.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/upgrade-notes.adoc
index 2ce99d0b5..6bb1e6e42 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/upgrade-notes.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/upgrade-notes.adoc
@@ -103,7 +103,7 @@ class SimpleAiController {
     private final ChatClient chatClient;
 
     SimpleAiController(ChatClient.Builder builder) {
-      this.builder = builder.build();
+      this.chatClient = builder.build();
     }
 
     @GetMapping("/ai/simple")