diff --git a/readme.md b/readme.md
index 1f996bc..06201d3 100644
--- a/readme.md
+++ b/readme.md
@@ -318,7 +318,7 @@ class mxxxxxx_xxxxxx_update_{table}_table_{column}_column extends Migration
      */
     public function safeUp()
     {
-        $this->update('{table}', ['{column}' => $this->getBitFlagExpression('{column}', 1, 'insert', {k})]);
+        $this->update('{table}', ['{column}' => $this->getBitFlagExpression('{column}', {pos}, 'insert', {k})]);
     }
 
     /**
@@ -326,7 +326,7 @@ class mxxxxxx_xxxxxx_update_{table}_table_{column}_column extends Migration
      */
     public function safeDown()
     {
-        $this->update('{table}', ['{column}' => $this->getBitFlagExpression('{column}', 1, 'delete')]);
+        $this->update('{table}', ['{column}' => $this->getBitFlagExpression('{column}', {pos}, 'delete')]);
     }
 
     /**