diff --git a/src/c/funktionen.h b/src/c/funktionen.h
index fde7c2c..82dc677 100644
--- a/src/c/funktionen.h
+++ b/src/c/funktionen.h
@@ -65,5 +65,7 @@ float logarithmPlusOne(float x);
 // Function to calculate the natural logarithm (base e) of a number and add 1
 float naturalLogarithmPlusOne(float x);
 
+// Function to calculate the square root of a number and add 1
+float squareRootPlusOne(float x);
 
 #endif
\ No newline at end of file