--- gforth/doc/gforth.ds	2000/09/23 15:47:05	1.88
+++ gforth/doc/gforth.ds	2000/09/23 18:20:19	1.89
@@ -1043,7 +1043,8 @@ are given.
 
 In addition to the @file{gforth} engine, there is also an engine called
 @file{gforth-fast}, which is faster, but gives less informative error
-messages (@pxref{Error messages}).
+messages (@pxref{Error messages}).  You should use it for debugged,
+performance-critical programs.
 
 In general, the command line looks like this: