diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c1a0fd34..4381d56a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,6 @@
 # Adding a new modeling command
 
- - In `each_command.rs` add your new `struct MyNewCommand` with one field for each parameter the command has.
+ - In `each_cmd.rs` add your new `struct MyNewCommand` with one field for each parameter the command has.
  - In `def_enum.rs` add a new variant of `ModelingCmd` with your type, e.g. `MyNewCommand(MyNewCommand)`.
  - If your command responds with data:
    - In `output.rs`, add a `struct MyNewCommand` following the existing examples.
diff --git a/modeling-cmds/src/def_enum.rs b/modeling-cmds/src/def_enum.rs
index 3b38b073..8144f8cb 100644
--- a/modeling-cmds/src/def_enum.rs
+++ b/modeling-cmds/src/def_enum.rs
@@ -163,6 +163,8 @@ pub enum ModelingCmd {
     ObjectSetMaterialParamsPbr(ObjectSetMaterialParamsPbr),
     /// What is the distance between these two entities?
     EntityGetDistance(EntityGetDistance),
+    /// Duplicate the given entity, evenly spaced along the chosen axis.
+    EntityLinearPattern(EntityLinearPattern),
 }
 
 impl ModelingCmd {
diff --git a/modeling-cmds/src/each_cmd.rs b/modeling-cmds/src/each_cmd.rs
index c6ed05a1..b907ced9 100644
--- a/modeling-cmds/src/each_cmd.rs
+++ b/modeling-cmds/src/each_cmd.rs
@@ -189,6 +189,19 @@ pub struct EntityGetDistance {
     pub distance_type: DistanceType,
 }
 
+/// Create a linear pattern using this entity (currently only valid for 3D solids).
+#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
+pub struct EntityLinearPattern {
+    /// ID of the entity being copied.
+    pub entity_id: Uuid,
+    /// Axis along which to make the copites
+    pub axis: Point3d<f64>,
+    /// Number of repetitions to make.
+    pub num_repetitions: u32,
+    /// Spacing between repetitions.
+    pub spacing: f64,
+}
+
 /// Enter edit mode
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
 pub struct EditModeEnter {
diff --git a/modeling-cmds/src/impl_traits.rs b/modeling-cmds/src/impl_traits.rs
index be6f2660..27d2a855 100644
--- a/modeling-cmds/src/impl_traits.rs
+++ b/modeling-cmds/src/impl_traits.rs
@@ -48,6 +48,7 @@ impl_variant_output!(EntityGetNumChildren);
 impl_variant_output!(EntityGetChildUuid);
 impl_variant_output!(EntityGetAllChildUuids);
 impl_variant_output!(EntityGetDistance);
+impl_variant_output!(EntityLinearPattern);
 impl_variant_empty!(EditModeEnter);
 impl_variant_output!(SelectWithPoint);
 impl_variant_empty!(SelectAdd);
diff --git a/modeling-cmds/src/ok_response.rs b/modeling-cmds/src/ok_response.rs
index cce27e29..ff56b6e3 100644
--- a/modeling-cmds/src/ok_response.rs
+++ b/modeling-cmds/src/ok_response.rs
@@ -33,6 +33,7 @@ build_enum! {
     SelectGet,
     GetEntityType,
     EntityGetDistance,
+    EntityLinearPattern,
     Solid3dGetAllEdgeFaces,
     Solid3dGetAllOppositeEdges,
     Solid3dGetOppositeEdge,
diff --git a/modeling-cmds/src/output.rs b/modeling-cmds/src/output.rs
index 78f46216..b23e1382 100644
--- a/modeling-cmds/src/output.rs
+++ b/modeling-cmds/src/output.rs
@@ -256,6 +256,13 @@ pub struct EntityGetDistance {
     pub max_distance: f64,
 }
 
+/// The response from the `EntityLinearPattern` command.
+#[derive(Debug, Serialize, Deserialize, JsonSchema)]
+pub struct EntityLinearPattern {
+    /// The UUIDs of the entities that were created.
+    pub entity_ids: Vec<Uuid>,
+}
+
 impl ModelingCmdOutput for Export {}
 impl ModelingCmdOutput for SelectWithPoint {}
 impl ModelingCmdOutput for HighlightSetEntity {}
@@ -264,6 +271,7 @@ impl ModelingCmdOutput for EntityGetNumChildren {}
 impl ModelingCmdOutput for EntityGetParentId {}
 impl ModelingCmdOutput for EntityGetAllChildUuids {}
 impl ModelingCmdOutput for EntityGetDistance {}
+impl ModelingCmdOutput for EntityLinearPattern {}
 impl ModelingCmdOutput for SelectGet {}
 impl ModelingCmdOutput for GetEntityType {}
 impl ModelingCmdOutput for Solid3dGetAllEdgeFaces {}