diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5fcb405b..b4be6835 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Changelog
 
+### [13.5.1](https://kaos.sh/ek/13.5.1)
+
+- `[mathutil]` Code refactoring
+
 ### [13.5.0](https://kaos.sh/ek/13.5.0)
 
 - `[support/resources]` Added package for collecting info about CPU and memory
diff --git a/mathutil/mathutil.go b/mathutil/mathutil.go
index 6631ee96..09dea125 100644
--- a/mathutil/mathutil.go
+++ b/mathutil/mathutil.go
@@ -122,12 +122,12 @@ func Abs[N NumericNeg](val N) N {
 }
 
 // Perc calculates percentage
-func Perc[N Numeric](val1, val2 N) float64 {
-	if val2 == 0 {
+func Perc[N Numeric](current, total N) float64 {
+	if current == 0 || total == 0 {
 		return 0
 	}
 
-	return float64(val1) / float64(val2) * 100.0
+	return (float64(current) / float64(total)) * 100.0
 }
 
 // Round returns rounded value
diff --git a/version.go b/version.go
index 3df16829..9efe2a5a 100644
--- a/version.go
+++ b/version.go
@@ -8,4 +8,4 @@ package ek
 // ////////////////////////////////////////////////////////////////////////////////// //
 
 // VERSION is current ek package version
-const VERSION = "13.5.0"
+const VERSION = "13.5.1"