diff --git a/src/c/funktionen.h b/src/c/funktionen.h
index a00e3f3..6f517c5 100644
--- a/src/c/funktionen.h
+++ b/src/c/funktionen.h
@@ -4,4 +4,7 @@
 // Function to calculate the square of a number
 float square(float x);
 
+// Function to calculate the square root of a number
+float squareRoot(float x);
+
 #endif
\ No newline at end of file