diff --git a/config.go b/config.go
index 65edfaf..f8d5367 100644
--- a/config.go
+++ b/config.go
@@ -122,6 +122,7 @@ type _strings struct{}
 func (_strings) Count(a, b string) int                { return strings.Count(a, b) }
 func (_strings) HasPrefix(a, b string) bool           { return strings.HasPrefix(a, b) }
 func (_strings) HasSuffix(a, b string) bool           { return strings.HasSuffix(a, b) }
+func (_strings) Join(elems []string, s string) string { return strings.Join(elems, s) }
 func (_strings) Repeat(s string, i int) string        { return strings.Repeat(s, i) }
 func (_strings) Replace(a, b, c string, n int) string { return strings.Replace(a, b, c, n) }
 func (_strings) ReplaceAll(a, b, c string) string     { return strings.ReplaceAll(a, b, c) }