diff --git a/pkgs/racket-doc/scribblings/reference/cont.scrbl b/pkgs/racket-doc/scribblings/reference/cont.scrbl
index 277fae7064..cd527dfc4d 100644
--- a/pkgs/racket-doc/scribblings/reference/cont.scrbl
+++ b/pkgs/racket-doc/scribblings/reference/cont.scrbl
@@ -182,15 +182,15 @@ called in tail position, and the continuation procedure supplied to
 @racket[proc] can only be called during the dynamic extent of the
 @racket[call-with-escape-continuation] call.
 
-Due to the limited applicability of its continuation,
-@racket[call-with-escape-continuation] can be implemented more efficiently
-than @racket[call-with-current-continuation].
-
 A continuation obtained from @racket[call-with-escape-continuation] is
 actually a kind of prompt. Escape continuations are provided mainly
 for backwards compatibility, since they pre-date general prompts in
-Racket, and because @racket[call/ec] is often an easy replacement
-for @racket[call/cc] to improve performance.}
+Racket. In the 3m and CGC variants of Racket,
+@racket[call-with-escape-continuation] is implemented more efficiently
+than @racket[call-with-current-continuation], so
+@racket[call-with-escape-continuation] can sometimes replace
+@racket[call-with-current-continuation] to improve performance in
+those older Racket variants.}
 
 @defproc[(call/ec
           [proc (continuation? . -> . any)])