diff --git a/README.md b/README.md
index 9c3b037..9aa0bea 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ IDEA 智能注释插件
 
 https://plugins.jetbrains.com/plugin/18553-show-comment
 
-
+Thanks JetBrains Licenses for Open Source.
 
 ## Notes 说明
 
@@ -56,6 +56,7 @@ https://plugins.jetbrains.com/plugin/18553-show-comment
 
 <h2>English Change Notes:</h2>
 <ul>
+<li>1.16  Add line-end-comment  skip when comments have been added
 <li>1.15  Add line-end-comment  support COBOL ext '', 'cbl', 'cob', 'cobol'
 <li>1.14  Add line-end-comment  skip Annotation, skip only English (ASCII)
 <li>1.13  Add Copy With Line Comment & Add Line Comment
@@ -75,6 +76,7 @@ https://plugins.jetbrains.com/plugin/18553-show-comment
 
 <h2>中文更新说明:</h2>
 <ul>
+<li>1.16  增加 行末注释 已经添加行末注释时跳过
 <li>1.15  增加 行末注释 COBOL 拓展名支持 无拓展名、cbl、cob、cobol
 <li>1.14  增加 行末注释 忽略注解 与 忽略纯英文
 <li>1.13  增加 带行末注释复制 和 添加行末注释
diff --git a/build.gradle b/build.gradle
index dc32239..511ac23 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'io.github.linwancen'
-version '1.15.0.' + (new Date().format('yyyy.MM.dd_HH.mm'))
+version '1.16.0.' + (new Date().format('yyyy.MM.dd_HH.mm'))
 
 apply plugin: 'java'
 
@@ -39,6 +39,7 @@ patchPluginXml {
     changeNotes = """
 <h2>English Change Notes:</h2>
 <ul>
+<li>1.16  Add line-end-comment  skip when comments have been added
 <li>1.15  Add line-end-comment  support COBOL ext '', 'cbl', 'cob', 'cobol'
 <li>1.14  Add line-end-comment  skip Annotation, skip only English (ASCII)
 <li>1.13  Add Copy With Line Comment & Add Line Comment
@@ -58,6 +59,7 @@ patchPluginXml {
 
 <h2>中文更新说明:</h2>
 <ul>
+<li>1.16  增加 行末注释 已经添加行末注释时跳过
 <li>1.15  增加 行末注释 COBOL 拓展名支持 无拓展名、cbl、cob、cobol
 <li>1.14  增加 行末注释 忽略注解 与 忽略纯英文
 <li>1.13  增加 带行末注释复制 和 添加行末注释
diff --git a/src/main/java/io/github/linwancen/plugin/show/Tree.java b/src/main/java/io/github/linwancen/plugin/show/Tree.java
index 2353d35..cec46ac 100644
--- a/src/main/java/io/github/linwancen/plugin/show/Tree.java
+++ b/src/main/java/io/github/linwancen/plugin/show/Tree.java
@@ -45,7 +45,7 @@ public class Tree implements ProjectViewNodeDecorator {
             if (coloredText.isEmpty()) {
                 data.addText(data.getPresentableText(), SimpleTextAttributes.REGULAR_ATTRIBUTES);
             }
-            data.addText(doc, SimpleTextAttributes.GRAY_ATTRIBUTES);
+            data.addText(" " + doc, SimpleTextAttributes.GRAY_ATTRIBUTES);
         });
     }
 
diff --git a/src/main/java/io/github/linwancen/plugin/show/doc/PsiDocToStrDoc.java b/src/main/java/io/github/linwancen/plugin/show/doc/PsiDocToStrDoc.java
index d44ef04..1c1e698 100644
--- a/src/main/java/io/github/linwancen/plugin/show/doc/PsiDocToStrDoc.java
+++ b/src/main/java/io/github/linwancen/plugin/show/doc/PsiDocToStrDoc.java
@@ -35,7 +35,6 @@ public class PsiDocToStrDoc {
         if (sb.length() == 0) {
             return null;
         }
-        sb.insert(0, " ");
         return sb.toString();
     }
 
diff --git a/src/main/java/io/github/linwancen/plugin/show/line/FileViewToDocStrUtils.java b/src/main/java/io/github/linwancen/plugin/show/line/FileViewToDocStrUtils.java
index 6cf5c4f..797a4a4 100644
--- a/src/main/java/io/github/linwancen/plugin/show/line/FileViewToDocStrUtils.java
+++ b/src/main/java/io/github/linwancen/plugin/show/line/FileViewToDocStrUtils.java
@@ -18,7 +18,7 @@ import java.util.regex.Pattern;
  * call LineExt, ~LeftToRight, ~RightToLeft
  */
 public class FileViewToDocStrUtils {
-    
+
     public static final Pattern NOT_ASCII_PATTERN = Pattern.compile("[^\u0000-\u007f]");
 
     private FileViewToDocStrUtils() {}
@@ -32,21 +32,34 @@ public class FileViewToDocStrUtils {
                              @Nullable VirtualFile file,
                              @Nullable FileViewProvider viewProvider,
                              int startOffset, int endOffset, @NotNull String text) {
+        AppSettingsState setting = AppSettingsState.getInstance();
         if (file != null) {
-            String extDoc = LineExt.extDoc(project, file.getPath(), file.getName(), file.getExtension(), text);
+            int i = text.indexOf(setting.lineEndPrefix);
+            String code = i <= 0 ? text : text.substring(0, i);
+            String extDoc = LineExt.extDoc(project, file.getPath(), file.getName(), file.getExtension(), code);
             if (extDoc != null) {
+                extDoc = extDoc.trim();
+                if (text.endsWith(extDoc)) {
+                    return null;
+                }
                 return extDoc;
             }
         }
         if (viewProvider == null) {
             return null;
         }
-        AppSettingsState setting = AppSettingsState.getInstance();
         PsiDocComment docComment = setting.findElementRightToLeft
                 ? FileViewToPsiDocRightToLeft.rightDoc(viewProvider, startOffset, endOffset)
                 : FileViewToPsiDocLeftToRight.leftDoc(viewProvider, document, startOffset, endOffset);
         String strDoc = PsiDocToStrDoc.text(docComment);
-        if (setting.skipAscii && strDoc != null && !NOT_ASCII_PATTERN.matcher(strDoc).find()) {
+        if (strDoc == null) {
+            return null;
+        }
+        strDoc = strDoc.trim();
+        if (text.endsWith(strDoc)) {
+            return null;
+        }
+        if (setting.skipAscii && !NOT_ASCII_PATTERN.matcher(strDoc).find()) {
             return null;
         }
         return strDoc;
@@ -72,7 +85,7 @@ public class FileViewToDocStrUtils {
                 String text = document.getText(new TextRange(startOffset, endOffset));
                 sb.append(text);
                 String doc = doc(document, project, file, viewProvider, startOffset, endOffset, text);
-                if (doc != null) {
+                if (doc != null && !text.endsWith(doc)) {
                     sb.append(settings.lineEndPrefix).append(doc);
                 }
             }
diff --git a/src/main/java/io/github/linwancen/plugin/show/settings/AppSettingsState.java b/src/main/java/io/github/linwancen/plugin/show/settings/AppSettingsState.java
index fab397d..88be5d6 100644
--- a/src/main/java/io/github/linwancen/plugin/show/settings/AppSettingsState.java
+++ b/src/main/java/io/github/linwancen/plugin/show/settings/AppSettingsState.java
@@ -30,7 +30,7 @@ public class AppSettingsState implements PersistentStateComponent<AppSettingsSta
             null, null, null, Font.ITALIC);
 
     public boolean findElementRightToLeft = true;
-    public String lineEndPrefix = "  //";
+    public String lineEndPrefix = "   // ";
     public int lineEndCount = 2;
     public int lineEndLen = 0;
     public boolean fromCall = true;