diff --git a/src/api2/types/mod.rs b/src/api2/types/mod.rs
index f240fb64..59323327 100644
--- a/src/api2/types/mod.rs
+++ b/src/api2/types/mod.rs
@@ -1177,7 +1177,8 @@ pub struct APTUpdateInfo {
     pub section: String,
     /// URL under which the package's changelog can be retrieved
     pub change_log_url: String,
-    /// Additional package information
+    /// Custom extra field for additional package information
+    #[serde(skip_serializing_if="Option::is_none")]
     pub extra_info: Option<String>,
 }