diff --git a/timely/src/dataflow/operators/concat.rs b/timely/src/dataflow/operators/core/concat.rs
similarity index 100%
rename from timely/src/dataflow/operators/concat.rs
rename to timely/src/dataflow/operators/core/concat.rs
diff --git a/timely/src/dataflow/operators/exchange.rs b/timely/src/dataflow/operators/core/exchange.rs
similarity index 100%
rename from timely/src/dataflow/operators/exchange.rs
rename to timely/src/dataflow/operators/core/exchange.rs
diff --git a/timely/src/dataflow/operators/filter.rs b/timely/src/dataflow/operators/core/filter.rs
similarity index 100%
rename from timely/src/dataflow/operators/filter.rs
rename to timely/src/dataflow/operators/core/filter.rs
diff --git a/timely/src/dataflow/operators/inspect.rs b/timely/src/dataflow/operators/core/inspect.rs
similarity index 100%
rename from timely/src/dataflow/operators/inspect.rs
rename to timely/src/dataflow/operators/core/inspect.rs
diff --git a/timely/src/dataflow/operators/probe.rs b/timely/src/dataflow/operators/core/probe.rs
similarity index 100%
rename from timely/src/dataflow/operators/probe.rs
rename to timely/src/dataflow/operators/core/probe.rs
diff --git a/timely/src/dataflow/operators/rc.rs b/timely/src/dataflow/operators/core/rc.rs
similarity index 100%
rename from timely/src/dataflow/operators/rc.rs
rename to timely/src/dataflow/operators/core/rc.rs
diff --git a/timely/src/dataflow/operators/reclock.rs b/timely/src/dataflow/operators/core/reclock.rs
similarity index 100%
rename from timely/src/dataflow/operators/reclock.rs
rename to timely/src/dataflow/operators/core/reclock.rs