diff --git a/src/c/funktionen.h b/src/c/funktionen.h
index 43f26bd..a46892d 100644
--- a/src/c/funktionen.h
+++ b/src/c/funktionen.h
@@ -71,4 +71,6 @@ float squareRootPlusOne(float x);
 // Function to calculate the cube root of a number and add 1
 float cubeRootPlusOne(float x);
 
+// Function to calculate the sine of an angle in degrees
+float sineDegrees(float x);
 #endif
\ No newline at end of file