diff --git a/src/Berrysoft.Unsafe/ByReference.cs b/src/Berrysoft.Unsafe/ByReference.cs
index 129b949..b91a31d 100644
--- a/src/Berrysoft.Unsafe/ByReference.cs
+++ b/src/Berrysoft.Unsafe/ByReference.cs
@@ -16,6 +16,7 @@ namespace Berrysoft.Unsafe
private readonly void* _ptr;
///
/// Initialize a with a reference.
+ /// Note: the storage of value should be pinned.
///
/// The reference.
[MethodImpl(MethodImplOptions.AggressiveInlining)]
diff --git a/src/Berrysoft.Unsafe/Pointer.cs b/src/Berrysoft.Unsafe/Pointer.cs
index 41a9aad..de1a43a 100644
--- a/src/Berrysoft.Unsafe/Pointer.cs
+++ b/src/Berrysoft.Unsafe/Pointer.cs
@@ -38,6 +38,7 @@ public Pointer(IntPtr ptr)
}
///
/// Initialize a with a reference.
+ /// Note: the storage of value should be pinned.
///
/// The reference.
[MethodImpl(MethodImplOptions.AggressiveInlining)]
diff --git a/src/Berrysoft.Unsafe/UnsafeMethods.cs b/src/Berrysoft.Unsafe/UnsafeMethods.cs
index 1a70191..10b6e04 100644
--- a/src/Berrysoft.Unsafe/UnsafeMethods.cs
+++ b/src/Berrysoft.Unsafe/UnsafeMethods.cs
@@ -18,6 +18,7 @@ public unsafe static class UnsafeMethods
public static int GetSize() => SizeOf();
///
/// Get a with a reference.
+ /// Note: the storage of value should be pinned.
///
/// Type of the pointer pointed to.
/// The reference.
@@ -47,6 +48,7 @@ public static Pointer PointerOf(string str)
}
///
/// Get a with a reference.
+ /// Note: the storage of value should be pinned.
///
/// Type of the pointer pointed to.
/// The reference.
@@ -55,6 +57,7 @@ public static Pointer PointerOf(string str)
public static ByReference ByReference(ref T value) => new ByReference(ref value);
///
/// Get a with a readonly reference.
+ /// Note: the storage of value should be pinned.
///
/// Type of the pointer pointed to.
/// The reference.