diff --git a/README.md b/README.md
index 60a98bf..9c3b037 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ https://plugins.jetbrains.com/plugin/18553-show-comment
 
 <h2>English Change Notes:</h2>
 <ul>
+<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
 <li>1.12   ★  External Comment for COBOL etc
@@ -74,6 +75,7 @@ https://plugins.jetbrains.com/plugin/18553-show-comment
 
 <h2>中文更新说明:</h2>
 <ul>
+<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
 <li>1.12   ★  外部注释用于 COBOL 等
diff --git a/build.gradle b/build.gradle
index 1477edf..dc32239 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'io.github.linwancen'
-version '1.14.0.' + (new Date().format('yyyy.MM.dd_HH.mm'))
+version '1.15.0.' + (new Date().format('yyyy.MM.dd_HH.mm'))
 
 apply plugin: 'java'
 
@@ -39,6 +39,7 @@ patchPluginXml {
     changeNotes = """
 <h2>English Change Notes:</h2>
 <ul>
+<li>1.15  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
 <li>1.12   ★  External Comment for COBOL etc
@@ -57,6 +58,7 @@ patchPluginXml {
 
 <h2>中文更新说明:</h2>
 <ul>
+<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
 <li>1.12   ★  外部注释用于 COBOL 等
diff --git a/src/main/java/io/github/linwancen/plugin/show/ext/LineExt.java b/src/main/java/io/github/linwancen/plugin/show/ext/LineExt.java
index a5305a3..40e1f14 100644
--- a/src/main/java/io/github/linwancen/plugin/show/ext/LineExt.java
+++ b/src/main/java/io/github/linwancen/plugin/show/ext/LineExt.java
@@ -30,7 +30,7 @@ public class LineExt {
             return null;
         }
         Map<String, Map<String, List<String>>> treeMap = ConfCache.treeMap(path);
-        if ("cbl".equals(ext)) {
+        if (ext == null || "cbl".equals(ext) || "cob".equals(ext) || "cobol".equals(ext)) {
             text = cblNotAndOr(text);
         }
         String[] words = pattern.split(text);
@@ -53,7 +53,7 @@ public class LineExt {
         }
         String key = matcher.group(1);
         // put NOT first
-        text = matcher.replaceAll("$2 ( $1 = '");
+        text = matcher.replaceAll(" $2 ( $1 = '");
         // add key after AND/OR
         return AND_OR_PATTERN.matcher(text).replaceAll("$1 " + key + " = '");
     }
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 f0e15fe..4ddbba2 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
@@ -48,7 +48,10 @@ class ConfCacheGetUtils {
                 map.put(levelStr + "\b" + confPath, entry.getValue());
             } else if (confName.endsWith((name + confMidExt))) {
                 map.put(levelStr + "\t" + confPath, entry.getValue());
-            } else if (ext != null) {
+            } else{
+                if (ext == null) {
+                    ext = "";
+                }
                 if ((ext + confMidExt).equals(confName)) {
                     map.put(levelStr + "\n" + confPath, entry.getValue());
                 } else if (confName.endsWith((ext + confMidExt))) {