diff --git a/app/src/main/java/net/micode/notes/data/Contact.java b/app/src/main/java/net/micode/notes/data/Contact.java
index d97ac5d..bec9a8c 100644
--- a/app/src/main/java/net/micode/notes/data/Contact.java
+++ b/app/src/main/java/net/micode/notes/data/Contact.java
@@ -26,7 +26,7 @@ import android.util.Log;
 import java.util.HashMap;
 
 public class Contact {
-    private static HashMap<String, String> sContactCache;
+    private static HashMap<String, String> sContactCache;// 用于缓存已查询过的联系人信息
     private static final String TAG = "Contact";
 
     private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER