diff --git a/src/main/c/main_taschenrechner.c b/src/main/c/main_taschenrechner.c
index eb9dad3..6820e7f 100644
--- a/src/main/c/main_taschenrechner.c
+++ b/src/main/c/main_taschenrechner.c
@@ -39,6 +39,7 @@ double tangentFunction(double angle) {
     return tan(angle * M_PI / 180.0);
 }
 
+//..
 // Logarithmic functions
 double logarithmFunction(double x) {
     // Logarithm with base 10
@@ -49,8 +50,11 @@ double naturalLogarithmFunction(double x) {
     // Natural logarithm (ln)
     return log(x);
 }
- 
 
+double logarithmBase2Function(double x) {
+    // Logarithm with base 2
+    return log2(x);
+}
 
 // scientificmode
 int scientificMode(){
diff --git a/src/main/c/taschenrechner.h b/src/main/c/taschenrechner.h
index 071fba0..1032900 100644
--- a/src/main/c/taschenrechner.h
+++ b/src/main/c/taschenrechner.h
@@ -22,6 +22,8 @@ double logarithmFunction(double x);
 
 double naturalLogarithmFunction(double x);
 
+double logarithmBase2Function(double x);
+
 int mode(int userChoice);
 
 int displayMenu();