diff --git a/symmath/symmath_check.py b/symmath/symmath_check.py
index c0e6456..a5a9bb8 100644
--- a/symmath/symmath_check.py
+++ b/symmath/symmath_check.py
@@ -255,6 +255,12 @@ def symmath_check(expect, ans, dynamath=None, options=None, debug=None, xml=None
 
     ###### PMathML input ######
     # convert mathml answer to formula
+    """
+    Everything below this line is poorly test-covered, probably broken, and potentially
+    unused. For more information see issue #39:
+    https://github.com/openedx/openedx-calc/issues/39
+    """
+
     try:
         mmlans = dynamath[0] if dynamath else None
     except Exception as err:  # lint-amnesty, pylint: disable=broad-except