diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/concepts.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/concepts.adoc
index c8600cdf5..9a2693e7a 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/concepts.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/concepts.adoc
@@ -130,7 +130,7 @@ The Spring AI project helps you with this task.
 
 == Output Parsing
 
-The output of AI models traditionally arrives as a `java.util.String`, even if you ask for the reply to be in JSON.
+The output of AI models traditionally arrives as a `java.lang.String`, even if you ask for the reply to be in JSON.
 It may be the correct JSON, but it is not a JSON data structure. It is just a string.
 Also, asking "`for JSON`" as part of the prompt is not 100% accurate.