diff --git a/errors.go b/errors.go
index e83fc6b..b84343d 100644
--- a/errors.go
+++ b/errors.go
@@ -1,23 +1,16 @@
 package jsonpointer
 
-import (
-	"reflect"
-)
-
 type pointerError string
 
 func (e pointerError) Error() string {
 	return string(e)
 }
 
-var jsonPointableType = reflect.TypeOf(new(JSONPointable)).Elem()
-var jsonSetableType = reflect.TypeOf(new(JSONSetable)).Elem()
-
 const (
 	// ErrPointer is an error raised by the jsonpointer package
 	ErrPointer pointerError = "JSON pointer error"
 
-	// ErrInvalidStart states that a JSON pointer must start with a separator
+	// ErrInvalidStart states that a JSON pointer must start with a separator ("/")
 	ErrInvalidStart pointerError = `JSON pointer must be empty or start with a "` + pointerSeparator
 
 	// ErrUnsupportedValueType indicates that a value of the wrong type is being set
diff --git a/pointer.go b/pointer.go
index 6604261..a08cd68 100644
--- a/pointer.go
+++ b/pointer.go
@@ -41,6 +41,9 @@ const (
 	pointerSeparator = `/`
 )
 
+var jsonPointableType = reflect.TypeOf(new(JSONPointable)).Elem()
+var jsonSetableType = reflect.TypeOf(new(JSONSetable)).Elem()
+
 // JSONPointable is an interface for structs to implement when they need to customize the
 // json pointer process
 type JSONPointable interface {