diff --git a/ee.c b/ee.c
index fd6a8b7..bd1e503 100644
--- a/ee.c
+++ b/ee.c
@@ -49,8 +49,9 @@ isNum(const char* query){
 int // Dependency of main()
 arrity(const char query){
     /*
-     * If query is a string, isOperator iff query is a
-     * supported operator.
+     * If query is a string corresponding to an operator in {+,x,-,/,^,!}, then
+     * arrity(query) is the number of operands required by the operator. 
+     * If query is any other string, arrity(query) is zero.
      */
     return (query == '+')? 2:
            (query == 'x')? 2: