diff --git a/caesar/caesar.js b/caesar/caesar.js
index b6dcd95..a4d935a 100644
--- a/caesar/caesar.js
+++ b/caesar/caesar.js
@@ -7,8 +7,9 @@ const caesar = function(string, shiftValue) {
 
 const codeSet = code => (code < 97 ? 65 : 97);
 
-// this function is just a fancy way of doing % so that it works with negative numbers
-// see this link for details:
+// This function implements a version of the modulo operator
+// that returns the smallest positive remainder even for negative inputs.
+// See this link for details:
 // https://stackoverflow.com/questions/4467539/javascript-modulo-gives-a-negative-result-for-negative-numbers
 const mod = (n, m) => (n % m + m) % m;