diff --git a/src/Calculator.java b/src/Calculator.java
index 8a4b66a4c0ec7488171ede6c6f7a63aa5ddc6bba..45d7d3b471de6339a514bbbf98d26a9774556a20 100644
--- a/src/Calculator.java
+++ b/src/Calculator.java
@@ -23,5 +23,11 @@ public class Calculator {
             }
             return a / b;
         }
+        public double squareRoot(double a) throws IllegalArgumentException {
+            if (a < 0) {
+                throw new IllegalArgumentException("Cannot compute the square root of a negative number");
+            }
+            return Math.sqrt(a);
+        }
 
 }