diff --git a/src/main/java/org/redkale/annotation/Nonnull.java b/src/main/java/org/redkale/annotation/Nonnull.java
index cc3d8c4fb..3a60325ab 100644
--- a/src/main/java/org/redkale/annotation/Nonnull.java
+++ b/src/main/java/org/redkale/annotation/Nonnull.java
@@ -6,6 +6,7 @@ package org.redkale.annotation;
 import java.lang.annotation.*;
 
 /**
+ * 标记值可以为null
  *
  * 详情见: https://redkale.org
  *
diff --git a/src/main/java/org/redkale/annotation/Nullable.java b/src/main/java/org/redkale/annotation/Nullable.java
index 145007439..602b1c6f0 100644
--- a/src/main/java/org/redkale/annotation/Nullable.java
+++ b/src/main/java/org/redkale/annotation/Nullable.java
@@ -6,6 +6,7 @@ package org.redkale.annotation;
 import java.lang.annotation.*;
 
 /**
+ * 标记值可以为null
  *
  * 详情见: https://redkale.org
  *
diff --git a/src/main/java/org/redkale/net/client/ClientFuture.java b/src/main/java/org/redkale/net/client/ClientFuture.java
index de2501c0b..4b3289f42 100644
--- a/src/main/java/org/redkale/net/client/ClientFuture.java
+++ b/src/main/java/org/redkale/net/client/ClientFuture.java
@@ -7,6 +7,7 @@ package org.redkale.net.client;
 
 import java.util.Objects;
 import java.util.concurrent.*;
+import org.redkale.annotation.Nonnull;
 import org.redkale.net.*;
 
 /**
@@ -20,8 +21,10 @@ import org.redkale.net.*;
  */
 public class ClientFuture<R extends ClientRequest, T> extends CompletableFuture<T> implements Runnable {
 
+    @Nonnull
     protected final R request;
 
+    @Nonnull
     protected final ClientConnection conn;
 
     private ScheduledFuture timeout;
diff --git a/src/main/java/org/redkale/util/Attribute.java b/src/main/java/org/redkale/util/Attribute.java
index 34d192db4..d4b6c5d40 100644
--- a/src/main/java/org/redkale/util/Attribute.java
+++ b/src/main/java/org/redkale/util/Attribute.java
@@ -8,6 +8,7 @@ package org.redkale.util;
 import java.lang.reflect.TypeVariable;
 import java.util.*;
 import java.util.function.*;
+import org.redkale.annotation.*;
 import static org.redkale.asm.ClassWriter.COMPUTE_FRAMES;
 import org.redkale.asm.*;
 import static org.redkale.asm.Opcodes.*;
@@ -98,6 +99,7 @@ public interface Attribute<T, F> {
      *
      * @return 字段的数据类型
      */
+    @Nonnull
     public Class<? extends F> type();
 
     /**
@@ -105,6 +107,7 @@ public interface Attribute<T, F> {
      *
      * @return 字段的数据泛型
      */
+    @Nonnull
     default java.lang.reflect.Type genericType() {
         return type();
     }
@@ -114,6 +117,7 @@ public interface Attribute<T, F> {
      *
      * @return 依附的类名
      */
+    @Nonnull
     public Class<T> declaringClass();
 
     /**
@@ -121,6 +125,7 @@ public interface Attribute<T, F> {
      *
      * @return 字段名
      */
+    @Nonnull
     public String field();
 
     /**
@@ -147,6 +152,7 @@ public interface Attribute<T, F> {
      *
      * @return 附加对象
      */
+    @Nullable
     default <E> E attach() {
         return null;
     }