diff --git a/py_ecc/bn128/bn128_field_elements.py b/py_ecc/bn128/bn128_field_elements.py
index 86d6a82..a1526c8 100644
--- a/py_ecc/bn128/bn128_field_elements.py
+++ b/py_ecc/bn128/bn128_field_elements.py
@@ -26,7 +26,7 @@ def inv(a, n):
         r = high//low
         nm, new = hm-lm*r, high-low*r
         lm, low, hm, high = nm, new, lm, low
-    return lm % n
+    return lm % n # The quotient of the second input by the greatest common divisor of the two inputs.
 
 # A class for field elements in FQ. Wrap a number in this class,
 # and it becomes a field element.