diff --git a/docs/reference/search/field-caps.asciidoc b/docs/reference/search/field-caps.asciidoc
index b7954585b12f2..6cb483e7a256e 100644
--- a/docs/reference/search/field-caps.asciidoc
+++ b/docs/reference/search/field-caps.asciidoc
@@ -30,6 +30,7 @@ POST _field_caps
 }
 --------------------------------------------------
 // CONSOLE
+// TEST[warning:Specifying a request body is deprecated -- the [fields] request parameter should be used instead.]
 
 This is equivalent to the previous request.