6 files changed, 9 insertions, 6 deletions
diff --git a/lib/stdlib/src/digraph.erl b/lib/stdlib/src/digraph.erl
index b5f52da921..5edc868a94 100644
--- a/lib/stdlib/src/digraph.erl
+++ b/lib/stdlib/src/digraph.erl
@@ -36,7 +36,7 @@
 
 -export([get_short_path/3, get_short_cycle/2]).
 
--export_type([d_type/0, vertex/0]).
+-export_type([digraph/0, d_type/0, vertex/0]).
 
 -record(digraph, {vtab = notable :: ets:tab(),
 		  etab = notable :: ets:tab(),
diff --git a/lib/stdlib/src/gb_sets.erl b/lib/stdlib/src/gb_sets.erl
index 086dc79b46..113f29e252 100644
--- a/lib/stdlib/src/gb_sets.erl
+++ b/lib/stdlib/src/gb_sets.erl
@@ -657,7 +657,7 @@ intersection_2([], _, As, S) ->
 intersection_2(_, [], As, S) ->
     {S, balance_revlist(As, S)}.
 
--spec intersection([gb_set()]) -> gb_set().
+-spec intersection([gb_set(),...]) -> gb_set().
 
 intersection([S | Ss]) ->
     intersection_list(S, Ss).
diff --git a/lib/stdlib/src/lists.erl b/lib/stdlib/src/lists.erl
index 08ee595f4d..431e5b114e 100644
--- a/lib/stdlib/src/lists.erl
+++ b/lib/stdlib/src/lists.erl
@@ -350,7 +350,7 @@ sort_1(X, [], R) ->
 %% merge(List) -> L
 %%  merges a list of sorted lists
 
--spec merge([T]) -> [T].
+-spec merge([[T]]) -> [T].
 
 merge(L) ->
     mergel(L, []).
@@ -842,7 +842,7 @@ usort_1(X, []) ->
 %% umerge(List) -> L
 %%  merges a list of sorted lists without duplicates, removes duplicates
 
--spec umerge([T]) -> [T].
+-spec umerge([[T]]) -> [T].
 
 umerge(L) ->
     umergel(L).
diff --git a/lib/stdlib/src/orddict.erl b/lib/stdlib/src/orddict.erl
index c7b52b933e..8a13992785 100644
--- a/lib/stdlib/src/orddict.erl
+++ b/lib/stdlib/src/orddict.erl
@@ -151,7 +151,7 @@ map(F, [{Key,Val}|D]) ->
     [{Key,F(Key, Val)}|map(F, D)];
 map(F, []) when is_function(F, 2) -> [].
 
--spec filter(fun((term(), term()) -> term()), orddict()) -> orddict().
+-spec filter(fun((term(), term()) -> boolean()), orddict()) -> orddict().
 
 filter(F, [{Key,Val}=E|D]) ->
     case F(Key, Val) of
diff --git a/lib/stdlib/src/ordsets.erl b/lib/stdlib/src/ordsets.erl
index 05041c15f1..e992b66714 100644
--- a/lib/stdlib/src/ordsets.erl
+++ b/lib/stdlib/src/ordsets.erl
@@ -147,7 +147,7 @@ intersection(_, []) ->
 %% intersection([OrdSet]) -> OrdSet.
 %%  Return the intersection of the list of ordered sets.
 
--spec intersection([ordset(_)]) -> ordset(_).
+-spec intersection([ordset(_),...]) -> ordset(_).
 
 intersection([S1,S2|Ss]) ->
     intersection1(intersection(S1, S2), Ss);
diff --git a/lib/stdlib/src/timer.erl b/lib/stdlib/src/timer.erl
index 24e14caa69..b456c5d6c1 100644
--- a/lib/stdlib/src/timer.erl
+++ b/lib/stdlib/src/timer.erl
@@ -33,6 +33,9 @@
 %% internal exports for test purposes only
 -export([get_status/0]).
 
+%% types which can be used by other modules
+-export_type([tref/0]).
+
 %% Max
 -define(MAX_TIMEOUT, 16#0800000).
 -define(TIMER_TAB, timer_tab).