diff --git a/002-values.go b/002-values.go
index c12f0ab..3bba1f7 100644
--- a/002-values.go
+++ b/002-values.go
@@ -1,13 +1,26 @@
-package main
-
+package main                           // Go has various value types, including strings,
+                                       // different types of numbers, booleans, etc.
 import "fmt"
 
-func zero(x int) {
-    x = 0
+func main() {
+    fmt.Println("Hello world")         // Strings.
+    fmt.Println("Hello " + "other")
+
+    fmt.Println("1+1 =", 1+1)          // Integers and floats.
+    fmt.Println("7.0/3.0 =", 7.0/3.0)
+
+    fmt.Println(true && false)         // Booleans.
+    fmt.Println(true || false)
+    fmt.Println(!true)
 }
 
-func main() {
-    x := 5
-    zero(x)
-    fmt.Println(x)
-}
+/*
+$ go run values.go
+Hello world
+Hello other
+1+1 = 2
+7.0/3.0 = 2.3333333333333335
+false
+true
+false
+*/
diff --git a/02-values.go b/02-values.go
deleted file mode 100644
index 3bba1f7..0000000
--- a/02-values.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package main                           // Go has various value types, including strings,
-                                       // different types of numbers, booleans, etc.
-import "fmt"
-
-func main() {
-    fmt.Println("Hello world")         // Strings.
-    fmt.Println("Hello " + "other")
-
-    fmt.Println("1+1 =", 1+1)          // Integers and floats.
-    fmt.Println("7.0/3.0 =", 7.0/3.0)
-
-    fmt.Println(true && false)         // Booleans.
-    fmt.Println(true || false)
-    fmt.Println(!true)
-}
-
-/*
-$ go run values.go
-Hello world
-Hello other
-1+1 = 2
-7.0/3.0 = 2.3333333333333335
-false
-true
-false
-*/
diff --git a/021-varadic.go b/021-varadic.go
new file mode 100644
index 0000000..f764108
--- /dev/null
+++ b/021-varadic.go
@@ -0,0 +1,18 @@
+package main                          // Varadic functions can be called with any number of
+                                      // trailing arguments.
+import "fmt"
+
+func add(nums ...int) int {           // Varadic args are declared with `...type` and passed in as
+    for _, num := range nums {        // a slice.
+        total += num                
+    }
+    return total                    
+}                                   
+                                    
+func main() {                       
+    fmt.Println(add(1, 2))            // Varadic functions can be called in the usual way.
+    fmt.Println(add(1, 2, 3, 4))    
+                                    
+    nums := []int{2, 3, 4, 5}         // If you already have multiple args in a `slice`, apply
+    fmt.Println1(add(1, nums...))     // them to a varadic function using `func(arg, slice...)`.
+}
diff --git a/021-varargs.go b/021-varargs.go
deleted file mode 100644
index 42a4434..0000000
--- a/021-varargs.go
+++ /dev/null
@@ -1,21 +0,0 @@
-                                      // Varadic functions can be called with any number of
-									  // trailing arguments.
-
-package main
-
-import "fmt"
-
-func add(nums ...int) int {           // Varadic args are declared with `...type` and passed in as
-	for _, num := range nums {        // a slice.
-		total += num                
-	}                               
-	return total                    
-}                                   
-                                    
-func main() {                       
-	fmt.Println(add(1, 2))            // Varadic functions can be called in the usual way.
-	fmt.Println(add(1, 2, 3, 4))    
-                                    
-	nums := []int{2, 3, 4, 5}         // If you already have multiple args in a `slice`, apply
-	fmt.Println1(add(1, nums...))     // them to a varadic function using `func(arg, slice...)`.
-}
diff --git a/tool/index.txt b/tool/index.txt
index 0c788a3..9d90a66 100644
--- a/tool/index.txt
+++ b/tool/index.txt
@@ -18,7 +18,7 @@ ok-guards
 nesting
 functions
 returns
-varargs
+varadic
 closures
 recursion
 defer