diff --git a/collects/scribblings/scribble/basic.scrbl b/collects/scribblings/scribble/basic.scrbl
index fab7f608..d4a6131c 100644
--- a/collects/scribblings/scribble/basic.scrbl
+++ b/collects/scribblings/scribble/basic.scrbl
@@ -189,7 +189,13 @@ strings for a hierarchy, such as @scheme['("strings" "plain")] for a
 the strings are ``cleaned'' using @scheme[clean-up-index-strings]. The
 strings (without clean-up) also serve as the text to render in the
 index. The @tech{decode}d @scheme[pre-content] is the text to appear
-inline as the index target.}
+inline as the index target.
+
+Use @scheme[index] when an index entry should point to a specific word
+or phrase within the typeset document (i.e., the
+@scheme[pre-content]). Use @scheme[section-index], instead, to create
+an index entry that leads to a section, instead of a specific word or
+phrase within the section.}
 
 
 @defproc[(index* [words (listof string?)]