diff --git a/docs/cmdline-opts/write-out.d b/docs/cmdline-opts/write-out.d
index 7b84b75e4a..bb26528b5d 100644
--- a/docs/cmdline-opts/write-out.d
+++ b/docs/cmdline-opts/write-out.d
@@ -65,7 +65,7 @@ server. (Added in 7.15.4)
 .B header_json
 A JSON object with all HTTP response headers from the recent transfer. Values
 are provided as arrays, since in the case of multiple headers there can be
-multiple values.
+multiple values. (Added in 7.83.0)
 
 The header names provided in lowercase, listed in order of appearance over the
 wire. Except for duplicated headers. They are grouped on the first occurrence