--- a/cmajor++/Cm/Cm.Debugger/DevEnvInput.soul
+++ b/cmajor++/Cm/Cm.Debugger/DevEnvInput.soul
@@ -28,6 +28,8 @@
             |   "<cmdb.request<[[frame " Arg:frmarg "]]>"{ value = DevEnvCommand("frame", frmarg); }
             |   "<cmdb.request<[[show libraries]]>"{ value = DevEnvCommand("show libraries"); }
             |   "<cmdb.request<[[set debug library " LibraryName:lib " " OnOff:onoff "]]>"{ value = DevEnvCommand("set debug library", lib, onoff); }
+            |   "<cmdb.request<[[set break on throw on]]>"{ value = DevEnvCommand("set break on throw on"); }
+            |   "<cmdb.request<[[set break on throw off]]>"{ value = DevEnvCommand("set break on throw off"); }
             |   token(anychar*){ value = DevEnvCommand("input", match); }
             ;