diff --git a/src/c/funktionen.h b/src/c/funktionen.h
index 9726659..e26c1a5 100644
--- a/src/c/funktionen.h
+++ b/src/c/funktionen.h
@@ -58,4 +58,7 @@ float degreesToRadians(float x);
 
 // Function to convert radians to degrees
 float radiansToDegrees(float x);
+
+// Function to calculate the base 10 logarithm of a number and add 1
+float logarithmPlusOne(float x);
 #endif
\ No newline at end of file