Et hop, la doc ! https://contrib.spip.net/5205

css/spip_colonne.scss

@@ -11,7 +11,7 @@
 @include skel-breakpoints((
 	xlarge: '(max-width: 1680px)',
 	large: '(max-width: 1280px)',
-	medium: '(max-width: 980px)',
+	medium: '(max-width: 980px)', /* .col-12-medium les colonnes s'annulent */
 	small: '(max-width: 736px)', /* .col-12-small les colonnes s'annulent */
 	xsmall: '(max-width: 480px)',
 	xxsmall: '(max-width: 360px)',

paquet.xml

@@ -5,7 +5,7 @@
 	etat="test"
 	compatibilite="[3.1.0;3.2.*]"
 	logo="prive/themes/spip/images/colonne-64.png"
-	documentation="https://contrib.spip.net"
+	documentation="https://contrib.spip.net/5205"
 >
 	<nom>Raccourci~‹colonne›</nom>