diff --git a/src/scene/camera_ops.rs b/src/scene/camera_ops.rs
index e17ebfd7f..a1db36b48 100644
--- a/src/scene/camera_ops.rs
+++ b/src/scene/camera_ops.rs
@@ -567,8 +567,6 @@ impl Scene {
             viewport.view_target.x = center.x;
             viewport.view_target.y = center.y;
             viewport.view_target.z = center.z;
-            // Panning a viewport moves model geometry across the sheet; the
-            // dimensions drawn through it follow.
             self.notify_viewport_changed(handle);
         } else {
             self.camera.borrow_mut().target = center;
diff --git a/src/scene/modify.rs b/src/scene/modify.rs
index 9f1d41959..f91764067 100644
--- a/src/scene/modify.rs
+++ b/src/scene/modify.rs
@@ -730,10 +730,6 @@ impl Scene {
         // Complete group copies record their new Group objects and dictionary
         // entry as targeted object deltas inside copy_complete_groups.
         self.copy_complete_groups(&handle_map);
-        // A dimension copied together with everything it measures (its
-        // viewport, its block path and its source) keeps an association, with
-        // every handle remapped onto the copies. Copied on its own it keeps
-        // none — see `copy_dimension_associations`.
         self.copy_dimension_associations(&handle_map);
         // The copies are new handles (natural memo misses, tessellated fresh)
         // and reference only already-cached blocks — no block defn changes.
diff --git a/src/scene/mspace.rs b/src/scene/mspace.rs
index 3f804f11a..ab4dd423b 100644
--- a/src/scene/mspace.rs
+++ b/src/scene/mspace.rs
@@ -265,8 +265,6 @@ impl Scene {
                 vp.view_height = eff_h;
             }
         }
-        // A viewport's view changed, so every dimension drawn on the
-        // sheet through it has to be re-placed and re-measured.
         self.notify_viewport_changed(vp_handle);
     }
 
@@ -358,8 +356,6 @@ impl Scene {
             vp.view_target.y += model_delta.y as f64;
             vp.view_target.z += model_delta.z as f64;
         }
-        // A viewport's view changed, so every dimension drawn on the
-        // sheet through it has to be re-placed and re-measured.
         self.notify_viewport_changed(vp_handle);
     }
 
@@ -410,8 +406,6 @@ impl Scene {
                 }
             }
         }
-        // A viewport's view changed, so every dimension drawn on the
-        // sheet through it has to be re-placed and re-measured.
         self.notify_viewport_changed(vp_handle);
     }
 
@@ -490,8 +484,6 @@ impl Scene {
             vp.view_direction.z = dir.z as f64;
             vp.twist_angle = twist;
         }
-        // Twisting a viewport rotates model geometry on the sheet; the
-        // dimensions drawn through it follow.
         self.notify_viewport_changed(vp_handle);
     }
 
@@ -537,8 +529,6 @@ impl Scene {
             changed = true;
         }
         if changed {
-            // The view (and with it the sheet placement of everything drawn
-            // through this viewport) moved.
             self.notify_viewport_changed(vp_handle);
         }
         changed
diff --git a/src/snap.rs b/src/snap.rs
index ea71b6675..fa837110b 100644
--- a/src/snap.rs
+++ b/src/snap.rs
@@ -93,15 +93,8 @@ pub struct SnapResult {
     /// query, never by the engine itself.
     pub viewport: Option<Handle>,
     /// Owning entity of the geometry the snap landed on, when the engine could
-    /// attribute the feature to a wire.
-    ///
-    /// This is whatever the *wire* carries, which for anything drawn from a
-    /// block is the **top-level INSERT's** handle — nested inserts included,
-    /// because `block_cache` stamps the host insert's name onto every
-    /// expanded and clipped sub-wire. Resolving that to the inner entity plus
-    /// the instance path needs the document and the accepted model point, so
-    /// it happens once at accept time, in
-    /// `OpenCADStudio::resolve_source_block_path`, which fills
+    /// attribute the feature to a wire. Block sub-entities report the top-level
+    /// INSERT handle; the block path is resolved later by
     /// [`crate::scene::viewport_ref::SnapSourceRef::block_path`].
     pub source: Option<DimensionAssociationSource>,
     /// Second real object at an intersection, when both objects are known.
@@ -119,9 +112,6 @@ impl SnapResult {
 
 /// Entity handle carried by a wire (`WireModel::name` is the decimal handle
 /// value). Returns `None` for preview / interim wires with a symbolic name.
-///
-/// For block geometry the value is the top-level INSERT handle, never the
-/// inner entity: see [`SnapResult::source`].
 #[inline]
 pub(crate) fn wire_source(wire: &WireModel) -> Option<DimensionAssociationSource> {
     wire.name