diff --git a/src/riak_pipe_builder.erl b/src/riak_pipe_builder.erl
index e32ba2c..4c22490 100644
--- a/src/riak_pipe_builder.erl
+++ b/src/riak_pipe_builder.erl
@@ -52,6 +52,7 @@
                 sinkmon :: reference()}). % monitor ref
 
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %%%===================================================================
 %%% API
diff --git a/src/riak_pipe_fitting.erl b/src/riak_pipe_fitting.erl
index c30fc6c..d684d34 100644
--- a/src/riak_pipe_fitting.erl
+++ b/src/riak_pipe_fitting.erl
@@ -62,7 +62,7 @@
 
 -opaque state() :: #state{}.
 
--export_type([details/0]).
+-export_type([state/0, details/0]).
 -type details() :: #fitting_details{}.
 
 %%%===================================================================
diff --git a/src/riak_pipe_vnode.erl b/src/riak_pipe_vnode.erl
index b23a7ee..e79575e 100644
--- a/src/riak_pipe_vnode.erl
+++ b/src/riak_pipe_vnode.erl
@@ -115,6 +115,7 @@
                          | #handoff{}}).
 
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 -record(cmd_enqueue, {fitting :: #fitting{},
                       input :: term(),
diff --git a/src/riak_pipe_vnode_worker.erl b/src/riak_pipe_vnode_worker.erl
index 986d5e4..449210d 100644
--- a/src/riak_pipe_vnode_worker.erl
+++ b/src/riak_pipe_vnode_worker.erl
@@ -161,6 +161,7 @@
                 vnode :: pid(),
                 modstate :: term()}).
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %% @doc Get information about this behavior.
 -spec behaviour_info(atom()) -> 'undefined' | [{atom(), arity()}].
diff --git a/src/riak_pipe_w_crash.erl b/src/riak_pipe_w_crash.erl
index c04c8d7..56efad3 100644
--- a/src/riak_pipe_w_crash.erl
+++ b/src/riak_pipe_w_crash.erl
@@ -33,6 +33,7 @@
 -record(state, {p :: riak_pipe_vnode:partition(),
                 fd :: riak_pipe_fitting:details()}).
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %% name of the table reMEMbering restarts
 -define(MEM, ?MODULE).
diff --git a/src/riak_pipe_w_fwd.erl b/src/riak_pipe_w_fwd.erl
index c5809bb..6e908c0 100644
--- a/src/riak_pipe_w_fwd.erl
+++ b/src/riak_pipe_w_fwd.erl
@@ -35,6 +35,7 @@
 
 -record(state, {fd :: riak_pipe_fitting:details()}).
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %% @doc Initialization just stows the fitting details in the module's
 %%      state, for sending traces in {@link process/3}.
diff --git a/src/riak_pipe_w_pass.erl b/src/riak_pipe_w_pass.erl
index 6e15f45..f5e6170 100644
--- a/src/riak_pipe_w_pass.erl
+++ b/src/riak_pipe_w_pass.erl
@@ -35,6 +35,7 @@
 -record(state, {p :: riak_pipe_vnode:partition(),
                 fd :: riak_pipe_fitting:details()}).
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %% @doc Initialization just stows the partition and fitting details in
 %%      the module's state, for sending outputs in {@link process/3}.
diff --git a/src/riak_pipe_w_rec_countdown.erl b/src/riak_pipe_w_rec_countdown.erl
index 065f8ff..0ab0159 100644
--- a/src/riak_pipe_w_rec_countdown.erl
+++ b/src/riak_pipe_w_rec_countdown.erl
@@ -81,6 +81,7 @@
 -record(state, {p :: riak_pipe_vnode:partition(),
                 fd :: riak_pipe_fitting:details()}).
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %% @doc Initialization just stows the partition and fitting details in
 %%      the module's state, for sending outputs in {@link process/3}.
diff --git a/src/riak_pipe_w_reduce.erl b/src/riak_pipe_w_reduce.erl
index c25c959..555ce18 100644
--- a/src/riak_pipe_w_reduce.erl
+++ b/src/riak_pipe_w_reduce.erl
@@ -93,6 +93,7 @@
                 p :: riak_pipe_vnode:partition(),
                 fd :: riak_pipe_fitting:details()}).
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %% @doc Setup creates the store for evaluation results (a dict()) and
 %%      stashes away the `Partition' and `FittingDetails' for later.
diff --git a/src/riak_pipe_w_tee.erl b/src/riak_pipe_w_tee.erl
index 29e6d76..c93ec74 100644
--- a/src/riak_pipe_w_tee.erl
+++ b/src/riak_pipe_w_tee.erl
@@ -38,6 +38,7 @@
 -record(state, {p :: riak_pipe_vnode:partition(),
                 fd :: riak_pipe_fitting:details()}).
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %% @doc Init just stashes the `Partition' and `FittingDetails' for later.
 -spec init(riak_pipe_vnode:partition(), riak_pipe_fitting:details()) ->
diff --git a/src/riak_pipe_w_xform.erl b/src/riak_pipe_w_xform.erl
index 1760d28..e0a78bd 100644
--- a/src/riak_pipe_w_xform.erl
+++ b/src/riak_pipe_w_xform.erl
@@ -55,6 +55,7 @@
 -record(state, {p :: riak_pipe_vnode:partition(),
                 fd :: riak_pipe_fitting:details()}).
 -opaque state() :: #state{}.
+-export_type([state/0]).
 
 %% @doc Init just stashes the `Partition' and `FittingDetails' for later.
 -spec init(riak_pipe_vnode:partition(), riak_pipe_fitting:details()) ->