diff --git a/src/c/funktionen.h b/src/c/funktionen.h
index dc466f6..c4c1f27 100644
--- a/src/c/funktionen.h
+++ b/src/c/funktionen.h
@@ -43,4 +43,7 @@ float maximum(float x, float y);
 // Function to calculate the minimum of two numbers
 float minimum(float x, float y);
 
+// Function to calculate the average of two numbers
+float average(float x, float y);
+
 #endif
\ No newline at end of file