diff --git a/doc/em/ispace.nr b/doc/em/ispace.nr
index c95b55064..a2c592463 100644
--- a/doc/em/ispace.nr
+++ b/doc/em/ispace.nr
@@ -45,6 +45,7 @@ the trapping instruction (see next chapter).
 the GTO instruction, which is used for non-local goto's.
 It can remove several frames from the stack and transfer
 control to an active procedure.
+(see also MES~11 in paragraph 11.1.4.4)
 .PE
 .IE
 .P