diff --git a/mouse.cpp b/mouse.cpp
index 8939a74..6c87ae7 100644
--- a/mouse.cpp
+++ b/mouse.cpp
@@ -1103,6 +1103,10 @@ void GraphicsWindow::MouseLeftDoubleClick(double mx, double my) {
         ClearSuper();
 
         Constraint *c = SK.GetConstraint(constraintBeingEdited);
+        if(!c->HasLabel()) {
+            // Not meaningful to edit a constraint without a dimension
+            return;
+        }
         if(c->reference) {
             // Not meaningful to edit a reference dimension
             return;
diff --git a/wishlist.txt b/wishlist.txt
index 339bf0d..9b8387e 100644
--- a/wishlist.txt
+++ b/wishlist.txt
@@ -1,5 +1,6 @@
 
 -----
+better level of detail
 associative entities from solid model, as a special group
 some kind of import
 faster triangulation