diff --git a/Calculators/Pythagorean-Theorem-Calculator/script.js b/Calculators/Pythagorean-Theorem-Calculator/script.js
index d799195c7..56b09d5c3 100644
--- a/Calculators/Pythagorean-Theorem-Calculator/script.js
+++ b/Calculators/Pythagorean-Theorem-Calculator/script.js
@@ -2,12 +2,12 @@ function calculate() {
     var sideA = parseFloat(document.getElementById('sideA').value);
     var sideB = parseFloat(document.getElementById('sideB').value);
 
-    if (isNaN(sideA) || isNaN(sideB)) {
-        alert("Please enter valid numerical values for side A and side B.");
+    if (isNaN(sideA) || isNaN(sideB) || sideA <= 0 || sideB <= 0) {
+        alert("It looks like one or both of your inputs are missing or not positive. Please enter positive values for both sides.");
         return;
     }
 
     var sideC = Math.sqrt(Math.pow(sideA, 2) + Math.pow(sideB, 2));
 
     document.getElementById('result').innerHTML = "The length of side C is: " + sideC.toFixed(2);
-}
\ No newline at end of file
+}