diff --git a/doc/Making-image-pyramids.md b/doc/Making-image-pyramids.md
index 6fcef77e..d84f69e7 100644
--- a/doc/Making-image-pyramids.md
+++ b/doc/Making-image-pyramids.md
@@ -33,7 +33,7 @@ optional arguments:
    basename     - Base name to save to, input gchararray
    layout       - Directory layout, input VipsForeignDzLayout
 			default: dz
-			allowed: dz, zoomify, google
+			allowed: dz, zoomify, google, iiif, iiif3
    suffix       - Filename suffix for tiles, input gchararray
    overlap      - Tile overlap in pixels, input gint
 			default: 1