diff --git a/app-proto/src/add_remove.rs b/app-proto/src/add_remove.rs
index 5590b6c..ba02e65 100644
--- a/app-proto/src/add_remove.rs
+++ b/app-proto/src/add_remove.rs
@@ -4,6 +4,8 @@ use web_sys::{console, wasm_bindgen::JsValue};
 use crate::{engine, AppState, assembly::{Assembly, Constraint, Element}};
 
 /* DEBUG */
+// load an example assembly for testing. this code will be removed once we've
+// built a more formal test assembly system
 fn load_gen_assemb(assembly: &Assembly) {
     let _ = assembly.try_insert_element(
         Element::new(
@@ -56,6 +58,8 @@ fn load_gen_assemb(assembly: &Assembly) {
 }
 
 /* DEBUG */
+// load an example assembly for testing. this code will be removed once we've
+// built a more formal test assembly system
 fn load_low_curv_assemb(assembly: &Assembly) {
     let a = 0.75_f64.sqrt();
     let _ = assembly.try_insert_element(
@@ -226,9 +230,10 @@ pub fn AddRemove() -> View {
                     });
                 }
             ) { "🔗" }
-            select(bind:value=assembly_name) { /* DEBUG */
+            select(bind:value=assembly_name) { /* DEBUG */ // example assembly chooser
                 option(value="general") { "General" }
                 option(value="low-curv") { "Low-curvature" }
+                option(value="empty") { "Empty" }
             }
         }
     }