diff --git a/README.md b/README.md
index a6a60e2..79dabc6 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Thanks JetBrains Licenses for Open Source.
 <li>path/[any][filename.]ext.tree.tsv // file and folder tree comment 📝 📁
 <li>path/[any][filename.]ext.key.tsv  // line keywords to split and comment
 <li>path/[any][filename.]ext.doc.tsv  // line words comment
-<li>In path, "doc" can replace any, and can use % like in SQL
+<li>In path, "doc" can replace any, and can use % like in SQL, effect at previous layer when folder named -1
 <li>The lines in key.tsv will be concatenated with `|` to regexp; longer str should in front; startWith `?` to exclude
 <li>Chang tsv file in find pop window would not reload!
 <li>The tsv conf file must could be search in "Go to File"(Ctrl + Shift + N)
@@ -45,7 +45,7 @@ Thanks JetBrains Licenses for Open Source.
 <li>path/[any][filename.]ext.key.tsv  // 切割关键字与注释
 <li>path/[any][filename.]ext.doc.tsv  // 词注释
 <li>key.tsv 的每一行将会用`|`连接起来形成正则表达式，较长的关键字应该放在前面，用 `?` 开头排除
-<li>doc 文件夹可以替换任何一层文件夹，可以像 SQL 那样用 % 模糊匹配
+<li>doc 文件夹可以替换任何一层文件夹，可以像 SQL 那样用 % 模糊匹配，文件夹名为 -1 时在上一层文件夹生效
 <li>在搜索弹出窗中修改 tsv 文件将不会被重加载
 <li>tsv 配置文件必须能被搜索(Ctrl + Shift + N)
 </ul>
@@ -56,6 +56,7 @@ Thanks JetBrains Licenses for Open Source.
 
 <h2>English Change Notes:</h2>
 <ul>
+<li>1.18  Add External Comment  effect at previous layer when folder named -1
 <li>1.17  Add line-end-comment  skip doc text or class/member name by regexp
 <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'
@@ -77,6 +78,7 @@ Thanks JetBrains Licenses for Open Source.
 
 <h2>中文更新说明:</h2>
 <ul>
+<li>1.18  增加 外部注释 文件夹名为 -1 时配置在上一层文件夹生效
 <li>1.17  增加 行末注释 根据正则表达式跳过指定注释文本或类成员名字的注释
 <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
diff --git a/build.gradle b/build.gradle
index 9dce0a8..7b1e79e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'io.github.linwancen'
-version '1.17.0.' + (new Date().format('yyyy.MM.dd_HH.mm'))
+version '1.18.0.' + (new Date().format('yyyy.MM.dd_HH.mm'))
 
 apply plugin: 'java'
 
@@ -39,6 +39,7 @@ patchPluginXml {
     changeNotes = """
 <h2>English Change Notes:</h2>
 <ul>
+<li>1.18  Add External Comment  effect at previous layer when folder named -1
 <li>1.17  Add line-end-comment  skip doc text or class/member name by regexp
 <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'
@@ -60,6 +61,7 @@ patchPluginXml {
 
 <h2>中文更新说明:</h2>
 <ul>
+<li>1.18  增加 外部注释 文件夹名为 -1 时配置在上一层文件夹生效
 <li>1.17  增加 行末注释 根据正则表达式跳过指定注释文本或类成员名字的注释
 <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
diff --git a/src/main/java/io/github/linwancen/plugin/show/ext/conf/ConfCacheGetUtils.java b/src/main/java/io/github/linwancen/plugin/show/ext/conf/ConfCacheGetUtils.java
index 3b66277..3958e41 100644
--- a/src/main/java/io/github/linwancen/plugin/show/ext/conf/ConfCacheGetUtils.java
+++ b/src/main/java/io/github/linwancen/plugin/show/ext/conf/ConfCacheGetUtils.java
@@ -98,6 +98,15 @@ class ConfCacheGetUtils {
         String[] paths = StringUtils.split(path, '/');
         String[] confPaths = StringUtils.split(confPath, '/');
         int length = confPaths.length;
+        String lastFolder = confPaths[length - 2];
+        if (lastFolder.startsWith("-")) {
+            try {
+                int i = Integer.parseInt(lastFolder);
+                length = length + i - 1;
+            } catch (NumberFormatException e) {
+                // ignore
+            }
+        }
         if (length > paths.length) {
             return 0;
         }
diff --git a/src/main/resources/META-INF/plugin.xml b/src/main/resources/META-INF/plugin.xml
index 7e11d15..95731b0 100644
--- a/src/main/resources/META-INF/plugin.xml
+++ b/src/main/resources/META-INF/plugin.xml
@@ -19,7 +19,7 @@
 <li>path/[any][filename.]ext.tree.tsv // file and folder tree comment 📝 📁
 <li>path/[any][filename.]ext.key.tsv  // line keywords to split and comment
 <li>path/[any][filename.]ext.doc.tsv  // line words comment
-<li>In path, "doc" can replace any, and can use % like in SQL
+<li>In path, "doc" can replace any, and can use % like in SQL, effect at previous layer when folder named -1
 <li>The lines in key.tsv will be concatenated with `|` to regexp; longer str should in front; startWith `?` to exclude
 <li>Chang tsv file in find pop window would not reload!
 <li>The tsv conf file must could be search in "Go to File"(Ctrl + Shift + N)
@@ -42,7 +42,7 @@
 <li>path/[any][filename.]ext.key.tsv  // 切割关键字与注释
 <li>path/[any][filename.]ext.doc.tsv  // 词注释
 <li>key.tsv 的每一行将会用`|`连接起来形成正则表达式，较长的关键字应该放在前面，用 `?` 开头排除
-<li>doc 文件夹可以替换任何一层文件夹，可以像 SQL 那样用 % 模糊匹配
+<li>doc 文件夹可以替换任何一层文件夹，可以像 SQL 那样用 % 模糊匹配，文件夹名为 -1 时在上一层文件夹生效
 <li>在搜索弹出窗中修改 tsv 文件将不会被重加载
 <li>tsv 配置文件必须能被搜索(Ctrl + Shift + N)
 </ul>
diff --git a/src/test/java/io/github/linwancen/plugin/show/demo/ext/cobol/-1/previous layer demo.tree.tsv b/src/test/java/io/github/linwancen/plugin/show/demo/ext/cobol/-1/previous layer demo.tree.tsv
new file mode 100644
index 0000000..8f25802
--- /dev/null
+++ b/src/test/java/io/github/linwancen/plugin/show/demo/ext/cobol/-1/previous layer demo.tree.tsv	
@@ -0,0 +1,3 @@
+-1	上 1 层文件夹测试
+cobol	上 1 层文件夹测试
+ext	上 1 层文件夹测试（不应显示）
\ No newline at end of file
diff --git a/src/test/java/io/github/linwancen/plugin/show/demo/ext/cobol/-2/previous layer demo.tree.tsv b/src/test/java/io/github/linwancen/plugin/show/demo/ext/cobol/-2/previous layer demo.tree.tsv
new file mode 100644
index 0000000..c2c5f82
--- /dev/null
+++ b/src/test/java/io/github/linwancen/plugin/show/demo/ext/cobol/-2/previous layer demo.tree.tsv	
@@ -0,0 +1,3 @@
+-2	上 2 层文件夹测试
+cobol	上 2 层文件夹测试
+java	上 2 层文件夹测试
\ No newline at end of file