diff --git a/qutebrowser/utils/utils.py b/qutebrowser/utils/utils.py
index 08acfa727..37a72c07b 100644
--- a/qutebrowser/utils/utils.py
+++ b/qutebrowser/utils/utils.py
@@ -723,8 +723,8 @@ def guess_mimetype(filename: str, fallback: bool = False) -> str:
     """
     mimetype, _encoding = mimetypes.guess_type(filename)
     if os.path.splitext(filename)[1] == '.mjs' and mimetype == "text/plain":
-        # For unknown reasons, Windows (at least on GitHub Actions) wrongly
-        # gives us text/plain here.
+        # Windows can sometimes have .mjs registered wrongly as text/plain:
+        # https://github.com/golang/go/issues/68591
         return "text/javascript"
 
     if mimetype is None: