diff --git a/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json b/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json
index b625c9a672f..b53578810c7 100644
--- a/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json
+++ b/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json
@@ -99,7 +99,7 @@
   {
   	"name": "spring.http.converters.preferred-json-mapper",
   	"type": "java.lang.String",
-  	"description": "Preferred JSON mapper to use for HTTP message conversion."
+  	"description": "Preferred JSON mapper to use for HTTP message conversion. Set to \"gson\" to force the use of Gson when both it and Jackson are on the classpath."
   },
   {
     "name": "spring.jmx.default-domain",