diff --git a/src/nmreval/io/asciireader.py b/src/nmreval/io/asciireader.py
index e8a19ea..28ddbf8 100644
--- a/src/nmreval/io/asciireader.py
+++ b/src/nmreval/io/asciireader.py
@@ -41,7 +41,7 @@ class AsciiReader:
 
     def make_preview(self, num_lines: int):
         if num_lines <= len(self.lines):
-            return self.lines[:num_lines], max(self.width[:num_lines])
+            return self.lines[:num_lines], max(self.width[:num_lines]), self.line_comment
 
         num_lines += len(self.header)
         with self.fname.open('r') as f: