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-rw-r--r--doc/build-helpers/images/dockertools.section.md7
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diff --git a/doc/build-helpers/images/dockertools.section.md b/doc/build-helpers/images/dockertools.section.md
index 9317146b8f94e..831a42f25423e 100644
--- a/doc/build-helpers/images/dockertools.section.md
+++ b/doc/build-helpers/images/dockertools.section.md
@@ -178,6 +178,13 @@ Similarly, if you encounter errors similar to `Error_Protocol ("certificate has
 
   _Default value:_ 0.
 
+`compressor` (String; _optional_)
+
+: Selects the algorithm used to compress the image.
+
+  _Default value:_ `"gz"`.\
+  _Possible values:_ `"none"`, `"gz"`, `"zstd"`.
+
 `contents` **DEPRECATED**
 
 : This attribute is deprecated, and users are encouraged to use `copyToRoot` instead.