diff --git a/content/manuals/build/building/variables.md b/content/manuals/build/building/variables.md
index d3f4093f6c..74f184f734 100644
--- a/content/manuals/build/building/variables.md
+++ b/content/manuals/build/building/variables.md
@@ -375,6 +375,7 @@ Sets the type of the BuildKit progress output. Valid values are:
 - `auto` (default)
 - `plain`
 - `tty`
+- `quiet`
 - `rawjson`
 
 Usage: