diff --git a/tuftecms/templates/base.html b/tuftecms/templates/base.html
index 449d0b9..749b79a 100644
--- a/tuftecms/templates/base.html
+++ b/tuftecms/templates/base.html
@@ -591,8 +591,8 @@
                     // Python class names (class ClassName)
                     html = html.replace(/(\bclass\s+)([A-Za-z_][A-Za-z0-9_]*)/g, '$1<span style="font-weight: bold;">$2</span>');
 
-                    // JavaScript/C++/Java comments (// comment)
-                    html = html.replace(/(\s*\/\/.*)$/gm, '<span style="color: #888; font-style: italic;">$1</span>');
+                    // JavaScript/C++/Java comments (// comment) - only at line start, not in URLs
+                    html = html.replace(/^(\s*\/\/.*)$/gm, '<span style="color: #888; font-style: italic;">$1</span>');
 
                     // CSS/C/Java block comments (/* comment */)
                     html = html.replace(/(\/\*[\s\S]*?\*\/)/g, '<span style="color: #888; font-style: italic;">$1</span>');