diff --git a/src/configuration.ts b/src/configuration.ts
index a66eb68..49b5d06 100644
--- a/src/configuration.ts
+++ b/src/configuration.ts
@@ -148,6 +148,9 @@ export class Configuration {
         if (line.text.search(/^\s*\/\/\/\s*/) !== -1) {
           style = '///';
         }
+        if (line.text.search(/^\s*\/\/!\s*/) !== -1) {
+          style = '//!';
+        }
 
       } else if (style === '#' && line.text.search(/^\s*#\s*/) !== -1) {
         indentRegex = /#/;
diff --git a/src/rules.ts b/src/rules.ts
index 74473b3..1299d21 100644
--- a/src/rules.ts
+++ b/src/rules.ts
@@ -49,6 +49,10 @@ export class Rules {
       // e.g. /// ...|
       beforeText: /^\s*\/\/\//,
       action: { indentAction: IndentAction.None, appendText: '/// '}
+    },{ 
+      // e.g. //! ...|
+      beforeText: /^\s*\/\/!/,
+      action: { indentAction: IndentAction.None, appendText: '//! '}
     }
   ]