diff --git a/GFramework.Cqrs/GlobalUsings.cs b/GFramework.Cqrs/GlobalUsings.cs
index 3085d1e1..1e6e7889 100644
--- a/GFramework.Cqrs/GlobalUsings.cs
+++ b/GFramework.Cqrs/GlobalUsings.cs
@@ -7,3 +7,4 @@ global using System.Reflection;
 global using Microsoft.Extensions.DependencyInjection;
 global using System.Diagnostics;
 global using System.Collections.Concurrent;
+global using System.Runtime.CompilerServices;
diff --git a/GFramework.Cqrs/Internal/WeakKeyCache.cs b/GFramework.Cqrs/Internal/WeakKeyCache.cs
index 7377c2ca..dadf2db4 100644
--- a/GFramework.Cqrs/Internal/WeakKeyCache.cs
+++ b/GFramework.Cqrs/Internal/WeakKeyCache.cs
@@ -27,6 +27,7 @@ internal sealed class WeakKeyCache<TKey, TValue>
     /// <returns>已存在或新创建的缓存值。</returns>
     /// <exception cref="ArgumentNullException">
     ///     <paramref name="key" /> 或 <paramref name="valueFactory" /> 为 <see langword="null" />。
+    ///     或 <paramref name="valueFactory" /> 返回 <see langword="null" />。
     /// </exception>
     public TValue GetOrAdd(TKey key, Func<TKey, TValue> valueFactory)
     {
@@ -60,6 +61,7 @@ internal sealed class WeakKeyCache<TKey, TValue>
     /// <returns>已存在或新创建的缓存值。</returns>
     /// <exception cref="ArgumentNullException">
     ///     <paramref name="key" /> 或 <paramref name="valueFactory" /> 为 <see langword="null" />。
+    ///     或 <paramref name="valueFactory" /> 返回 <see langword="null" />。
     /// </exception>
     public TValue GetOrAdd<TState>(TKey key, TState state, Func<TKey, TState, TValue> valueFactory)
     {