diff --git a/src/config/container.rs b/src/config/container.rs
index dcc9225..8559358 100644
--- a/src/config/container.rs
+++ b/src/config/container.rs
@@ -659,8 +659,17 @@ impl Configuration {
             for ext in arg {
                 if let Some(stripped) = ext.strip_prefix('@') {
                       let contents = read_to_string(stripped).unwrap_or_else(|e| report_and_exit(&e.to_string()));
-                    extensions.extend(extensions_string.split('\n').map(|s| s.trim_start_matches('.').trim().to_string()));
-                    extensions = extensions.into_iter().filter(|s| !s.is_empty()).collect();
+                    let exts_from_file = contents.split('\n').filter_map(|s| {
+                        let trimmed = s.trim().trim_start_matches('.');
+
+                        if trimmed.is_empty() || trimmed.starts_with('#') {
+                            None
+                        } else {
+                            Some(trimmed.to_string())
+                        }
+                    });
+                    
+                    extensions.extend(exts_from_file);
                 } else {
                     extensions.push(ext.trim_start_matches('.').to_string());
                 }