diff --git a/Musicreater/_plugin_abc.py b/Musicreater/_plugin_abc.py
index 4d85746..0dd0c5e 100644
--- a/Musicreater/_plugin_abc.py
+++ b/Musicreater/_plugin_abc.py
@@ -219,7 +219,7 @@ class PluginMetaInformation(ABC):
     """插件版本号"""
     type: PluginTypes
     """插件类型"""
-    license: str = "MIT License"
+    license: str
     """插件发布时采用的许可协议"""
     dependencies: Sequence[str] = tuple()
     """插件是否对其他插件存在依赖"""
diff --git a/Musicreater/data.py b/Musicreater/data.py
index 9d64b38..fabd3dc 100644
--- a/Musicreater/data.py
+++ b/Musicreater/data.py
@@ -529,7 +529,7 @@ class SingleTrack(List[SingleNote]):
     """该音轨是否启用"""
 
     instrument: Instrument
-    """乐器ID"""
+    """该音轨所用的乐器"""
 
     is_high_time_precision: bool
     """该音轨是否使用高精度时间"""
@@ -596,7 +596,7 @@ class SingleTrack(List[SingleNote]):
         self.instrument = (
             track_instrument if track_instrument else DefaultInstrument.HARP.value
         )
-        """乐器ID"""
+        """该音轨所用之乐器"""
 
         self.is_high_time_precision = precise_time
         """是否使用高精度时间"""