diff --git a/calculator/src/main/java/com/oleg/calculator/CommandIntaker.java b/calculator/src/main/java/com/oleg/calculator/CommandIntaker.java
index 56de1bc..8ac82ad 100644
--- a/calculator/src/main/java/com/oleg/calculator/CommandIntaker.java
+++ b/calculator/src/main/java/com/oleg/calculator/CommandIntaker.java
@@ -134,6 +134,8 @@ private Double detectConstant(String word) {
             return Math.PI;
         } else if(word.equals("e")) {
             return Math.E;
+        } else if(word.equals("sqrt2")) {
+            return Math.sqrt(2);
         }
         return null;
     }
@@ -142,4 +144,4 @@ protected double getCurrentNumber() {
         return calc.getCurrentNumber();
     }
 
-}
\ No newline at end of file
+}