diff --git a/plume-common/src/activity_pub/mod.rs b/plume-common/src/activity_pub/mod.rs
index 40cbe05b..622c5508 100644
--- a/plume-common/src/activity_pub/mod.rs
+++ b/plume-common/src/activity_pub/mod.rs
@@ -573,7 +573,7 @@ where
     }
 }
 
-pub type LicensedArticle = Ext1<ApObject<Article>, Licensed07>;
+pub type LicensedArticle = Ext2<ApObject<Article>, Licensed07, SourceProperty>;
 
 pub trait ToAsString {
     fn to_as_string(&self) -> Option<String>;
@@ -689,6 +689,12 @@ mod tests {
             Licensed07 {
                 license: "CC-0".into(),
             },
+            SourceProperty {
+                source: Source {
+                    content: "content".into(),
+                    media_type: "text/plain".into(),
+                },
+            },
         );
         let expected = json!({
             "type": "Article",