diff --git a/framework/src/Volo.Abp.Authorization.Abstractions/Volo/Abp/Authorization/Permissions/IPermissionDefinitionContext.cs b/framework/src/Volo.Abp.Authorization.Abstractions/Volo/Abp/Authorization/Permissions/IPermissionDefinitionContext.cs
index c58c266e3f..4938d411bf 100644
--- a/framework/src/Volo.Abp.Authorization.Abstractions/Volo/Abp/Authorization/Permissions/IPermissionDefinitionContext.cs
+++ b/framework/src/Volo.Abp.Authorization.Abstractions/Volo/Abp/Authorization/Permissions/IPermissionDefinitionContext.cs
@@ -16,11 +16,11 @@ public interface IPermissionDefinitionContext
     /// </summary>
     /// <param name="name">Name of the group</param>
     /// <returns></returns>
-    PermissionGroupDefinition GetGroup([NotNull] string name);
+    PermissionGroupDefinition GetGroup(string name);
 
     /// <summary>
     /// Tries to get a pre-defined permission group.
-    /// Returns null if can not find the given group.
+    /// Returns null if it cannot find the given group.
     /// </summary>
     /// <param name="name">Name of the group</param>
     /// <returns></returns>
@@ -33,7 +33,7 @@ public interface IPermissionDefinitionContext
     /// <param name="displayName">Localized display name of the group</param>
     /// </summary>
     PermissionGroupDefinition AddGroup(
-        [NotNull] string name,
+        string name,
         ILocalizableString? displayName = null);
 
     /// <summary>
@@ -44,9 +44,9 @@ public interface IPermissionDefinitionContext
     void RemoveGroup(string name);
 
     /// <summary>
-    /// Tries to get a pre-defined permission group.
-    /// Returns null if can not find the given group.
-    /// <param name="name">Name of the group</param>
+    /// Tries to get a pre-defined permission from all defined groups.
+    /// Returns null if it cannot find the given permission.
+    /// <param name="name">Name of the permission</param>
     /// </summary>
-    PermissionDefinition? GetPermissionOrNull([NotNull] string name);
+    PermissionDefinition? GetPermissionOrNull(string name);
 }