diff --git a/crates/fj-kernel/src/validate/shell.rs b/crates/fj-kernel/src/validate/shell.rs
index 4d6e7f1de..46a9e186e 100644
--- a/crates/fj-kernel/src/validate/shell.rs
+++ b/crates/fj-kernel/src/validate/shell.rs
@@ -41,14 +41,22 @@ pub enum ShellValidationError {
     #[error(
         "Shell contains HalfEdges that are identical but do not coincide\n\
         Edge 1: {edge_1:#?}\n\
-        Edge 2: {edge_2:#?}"
+        Surface for edge 1: {surface_1:#?}\n\
+        Edge 2: {edge_2:#?}\n\
+        Surface for edge 2: {surface_2:#?}"
     )]
     IdenticalEdgesNotCoincident {
         /// The first edge
         edge_1: Handle<HalfEdge>,
 
+        /// The surface that the first edge is on
+        surface_1: Handle<Surface>,
+
         /// The second edge
         edge_2: Handle<HalfEdge>,
+
+        /// The surface that the second edge is on
+        surface_2: Handle<Surface>,
     },
 }
 
@@ -129,7 +137,9 @@ impl ShellValidationError {
                             errors.push(
                                 Self::IdenticalEdgesNotCoincident {
                                     edge_1: edge.0.clone(),
+                                    surface_1: edge.1.clone(),
                                     edge_2: other_edge.0.clone(),
+                                    surface_2: other_edge.1.clone(),
                                 }
                                 .into(),
                             )