diff --git a/src/localtime.erl b/src/localtime.erl
index 6a79da1..f6e0eac 100644
--- a/src/localtime.erl
+++ b/src/localtime.erl
@@ -17,6 +17,7 @@
      ,tz_name/2
      ,tz_shift/2
      ,tz_shift/3
+     ,fmt_shift/1
   ]).
 
 % utc_to_local(UtcDateTime, Timezone) -> LocalDateTime | [LocalDateTime, DstLocalDateTime] | {error, ErrDescr}