diff --git a/news/180.bugfix b/news/180.bugfix
new file mode 100644
index 0000000..d08f8cf
--- /dev/null
+++ b/news/180.bugfix
@@ -0,0 +1,2 @@
+Add sizes attribute to allowed picture variants
+[MrTango]
\ No newline at end of file
diff --git a/src/plone/base/interfaces/controlpanel.py b/src/plone/base/interfaces/controlpanel.py
index 0a365c9..caee665 100644
--- a/src/plone/base/interfaces/controlpanel.py
+++ b/src/plone/base/interfaces/controlpanel.py
@@ -1725,6 +1725,9 @@ class IImagingSchema(Interface):
                                         "media": {
                                             "type": "string",
                                         },
+                                        "sizes": {
+                                            "type": "string",
+                                        },
                                         "additionalScales": {
                                             "type": "array",
                                         },
@@ -1771,6 +1774,7 @@ class IImagingSchema(Interface):
                     {
                         "scale": "preview",
                         "additionalScales": ["large", "larger"],
+                        "sizes": "(min-width: 576px) 400px, (min-width: 768px) 600px, 98vw",
                     },
                 ],
             },