diff --git a/src/services/import.rs b/src/services/import.rs
index 9af22db..cb83b15 100644
--- a/src/services/import.rs
+++ b/src/services/import.rs
@@ -55,8 +55,13 @@ pub struct ImportOwnedCard {
     /// `cardsubtypeid`, resource ranges, …) onto this before calling Core.
     #[serde(default)]
     pub content_kind: ContentKind,
-    /// Optional per-instance stack size (a consumable's wire `amount`). Absent /
-    /// `null` means "not a stack"; it never collapses two instances into one row.
+    /// Optional per-instance stack size. Absent / `null` means "not a stack"; it
+    /// never collapses two instances into one row.
+    ///
+    /// NOT a consumable's wire `amount`: in FIFA 17 that field is the
+    /// definition's effect magnitude (a "+15 training" card), and every copy is
+    /// its own instance carrying the same value, so storing it here would claim
+    /// the club owns fifteen of them.
     #[serde(default)]
     pub quantity: Option<i64>,
 }