diff --git a/Sources/AmiiboService/Public/Clients/AmiiboLiveClient.swift b/Sources/AmiiboService/Public/Clients/AmiiboLiveClient.swift
index 004ccd0..d8c5d6e 100644
--- a/Sources/AmiiboService/Public/Clients/AmiiboLiveClient.swift
+++ b/Sources/AmiiboService/Public/Clients/AmiiboLiveClient.swift
@@ -157,6 +157,7 @@ private extension AmiiboLiveClient {
                         .map { Amiibo($0) }
                         .sorted { $0.identifier < $1.identifier }
                 case .none:
+                    // The service returns `"amiibo": null` when an `id` filter matches nothing.
                     return []
                 }
             }
diff --git a/Sources/AmiiboService/openapi.yaml b/Sources/AmiiboService/openapi.yaml
index c50b1b3..1992b91 100644
--- a/Sources/AmiiboService/openapi.yaml
+++ b/Sources/AmiiboService/openapi.yaml
@@ -564,7 +564,10 @@ components:
         $ref: '#/components/schemas/GameSeries'
 # Wrapper Entities
     AmiiboWrapper:
-      description: A response wrapper that contains zero, one, or more amiibos.
+      description: |
+        A response wrapper that contains zero, one, or more amiibos.
+
+        Note: Unlike the other response wrappers, the `amiibo` property is deliberately not required: the service returns `"amiibo": null` when an `id` filter matches nothing, and an empty list when other filters match nothing. The property must therefore remain optional for decoding to succeed in both cases.
       type: object
       properties:
         amiibo: