Index: library/nx/nx.tcl
===================================================================
diff -u -r40b842e5b218cc6144506ff4689671b780c4e8c5 -ra9bbc7c710172e6c24bf1c3a787263f9bcaf3384
--- library/nx/nx.tcl	(.../nx.tcl)	(revision 40b842e5b218cc6144506ff4689671b780c4e8c5)
+++ library/nx/nx.tcl	(.../nx.tcl)	(revision a9bbc7c710172e6c24bf1c3a787263f9bcaf3384)
@@ -1154,10 +1154,13 @@
     spec
     default:optional
   } {
-
     lassign [:parseParameterSpec -class $class -defaultopts $defaultopts -target $target $spec] \
         name parameterOptions class opts
 
+    if {[string first , $name] > -1} {
+      nsf::log warning "slot name '$name' contains suspicious characters"
+    }
+
     lappend opts -incremental $incremental
     if {[info exists default]} {
       lappend opts -default $default