diff --git a/api/birdxplorer_api/openapi_doc.py b/api/birdxplorer_api/openapi_doc.py
index c520f36..cb790ab 100644
--- a/api/birdxplorer_api/openapi_doc.py
+++ b/api/birdxplorer_api/openapi_doc.py
@@ -438,6 +438,22 @@ class FastAPIEndpointDocs(Generic[_KEY]):
     },
 }
 
+v1_data_notes_search_text: FastAPIEndpointParamDocs = {
+    "description": """
+指定した文字列を含む Note を検索して取得する。検索は Note の**Summaryに対して**行われる。
+""",
+    "openapi_examples": {
+        "default": {
+            "summary": "指定しない (デフォルト)",
+            "value": None,
+        },
+        "python": {
+            "summary": "「Python」を含む Post を取得する",
+            "value": "Python",
+        },
+    },
+}
+
 
 # GET /api/v1/data/notes のクエリパラメータの OpenAPI ドキュメント
 V1DataNotesDocs = FastAPIEndpointDocs(
@@ -452,6 +468,7 @@ class FastAPIEndpointDocs(Generic[_KEY]):
         "post_ids": v1_data_notes_post_ids,
         "current_status": v1_data_notes_current_status,
         "language": v1_data_notes_language,
+        "search_text": v1_data_notes_search_text,
     },
 )
 
diff --git a/api/birdxplorer_api/routers/data.py b/api/birdxplorer_api/routers/data.py
index 371df33..fbf32ee 100644
--- a/api/birdxplorer_api/routers/data.py
+++ b/api/birdxplorer_api/routers/data.py
@@ -206,7 +206,7 @@ def get_notes(
         post_ids: Union[List[PostId], None] = Query(default=None, **V1DataNotesDocs.params["post_ids"]),
         current_status: Union[None, List[str]] = Query(default=None, **V1DataNotesDocs.params["current_status"]),
         language: Union[LanguageIdentifier, None] = Query(default=None, **V1DataNotesDocs.params["language"]),
-        search_text: Union[None, str] = Query(default=None, **V1DataPostsDocs.params["search_text"]),
+        search_text: Union[None, str] = Query(default=None, **V1DataNotesDocs.params["search_text"]),
     ) -> NoteListResponse:
         if created_at_from is not None and isinstance(created_at_from, str):
             created_at_from = ensure_twitter_timestamp(created_at_from)