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-rw-r--r--lib/stdlib/src/sofs.erl3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/stdlib/src/sofs.erl b/lib/stdlib/src/sofs.erl
index b18df2ad09..c244e06ca4 100644
--- a/lib/stdlib/src/sofs.erl
+++ b/lib/stdlib/src/sofs.erl
@@ -621,6 +621,9 @@ canonical_relation(Sets) when ?IS_SET(Sets) ->
%%% Functions on binary relations only.
%%%
+-spec(rel2fam(BinRel) -> Family when
+ Family :: family(),
+ BinRel :: binary_relation()).
rel2fam(R) ->
relation_to_family(R).