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-rw-r--r--src/hex.erl1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/hex.erl b/src/hex.erl
index e3c8441..1eb1e6a 100644
--- a/src/hex.erl
+++ b/src/hex.erl
@@ -4,6 +4,7 @@
-module(hex).
-export([bin_to_hexstr/1,hexstr_to_bin/1]).
+-spec bin_to_hexstr(binary()) -> string().
bin_to_hexstr(Bin) ->
lists:flatten([io_lib:format("~2.16.0B", [X]) ||
X <- binary_to_list(Bin)]).