diff --git a/src/exponent.c b/src/exponent.c
index 0904080..7dd4455 100644
--- a/src/exponent.c
+++ b/src/exponent.c
@@ -64,10 +64,9 @@ unsigned long long fac(int x){
 
 double exponential(double x){
     double sum = 0.0;
-    for(int i = 0; i<=20; i++){
+    for(int i = 0; i<=21; i++){
         sum += (1.0/fac(i)*(powerD(i,x)));
     }
-    
     return sum;
 }
 
diff --git a/src/logarithmus.c b/src/logarithmus.c
index 9bd265d..b15c069 100644
--- a/src/logarithmus.c
+++ b/src/logarithmus.c
@@ -4,19 +4,19 @@
 #include "logarithmus.h"
 #include "exponent.h"
 
-double logX(double b, double a){
-    if(b == 1.0 || b <= 0.0 || a <= 0.0){
+double logX(double base, double value){
+    if(base == 1.0 || base <= 0.0 || value <= 0.0){
         return -1.0;
     }
-    return(logN(a, 0.00000001)/logN(b, 0.00000001));
+    return(logN(value, 0.00000001)/logN(base, 0.00000001));
 }
 
-double logDec(double a){
-    return logX(10.0, a);
+double log10(double value){
+    return logX(10.0, value);
 }
 
-double logBin(double a){
-    return logX(2.0, a);
+double log2(double value){
+    return logX(2.0, value);
 }
 
 double logN(double x, double eps){
diff --git a/src/logarithmus.h b/src/logarithmus.h
index 68b011f..e94f407 100644
--- a/src/logarithmus.h
+++ b/src/logarithmus.h
@@ -3,7 +3,7 @@
 
 double logN(double x, double eps);
 double logX(double b, double a);
-double logDec(double a);
-double logBin(double a);
+double log10(double a);
+double log2(double a);
 
 #endif // logarithmus.h
\ No newline at end of file
diff --git a/test/test_logarithmus.c b/test/test_logarithmus.c
index 3faad09..d31283b 100644
--- a/test/test_logarithmus.c
+++ b/test/test_logarithmus.c
@@ -82,12 +82,12 @@ void test_logarithmic_function_with_decimals(void){
 void test_logarithmic_function_to_base_10(void){
     double r1, r2, r3, r4, r5, r6;
 
-    r1 = logDec(100.0);
-    r2 = logDec(100.6479);
-    r3 = logDec(10.587);
-    r4 = logDec(4.341);
-    r5 = logDec(0.34979);
-    r6 = logDec(1.0);
+    r1 = log10(100.0);
+    r2 = log10(100.6479);
+    r3 = log10(10.587);
+    r4 = log10(4.341);
+    r5 = log10(0.34979);
+    r6 = log10(1.0);
 
     TEST_ASSERT_DOUBLE_WITHIN(0.000001, 2.0, r1);
     TEST_ASSERT_DOUBLE_WITHIN(0.000001, 2.002804, r2);
@@ -100,12 +100,12 @@ void test_logarithmic_function_to_base_10(void){
 void test_logarithmic_function_to_base_2(void){
     double r1, r2, r3, r4, r5, r6;
 
-    r1 = logBin(1024.0);
-    r2 = logBin(1024.8742);
-    r3 = logBin(900.587);
-    r4 = logBin(78.341);
-    r5 = logBin(0.34979);
-    r6 = logBin(1.0);
+    r1 = log2(1024.0);
+    r2 = log2(1024.8742);
+    r3 = log2(900.587);
+    r4 = log2(78.341);
+    r5 = log2(0.34979);
+    r6 = log2(1.0);
 
     TEST_ASSERT_DOUBLE_WITHIN(0.000001, 10.0, r1);
     TEST_ASSERT_DOUBLE_WITHIN(0.000001, 10.001231, r2);