diff --git a/pkgs/scribble-pkgs/scribble-doc/info.rkt b/pkgs/scribble-pkgs/scribble-doc/info.rkt
index 0b3c5a55..a0e2c53b 100644
--- a/pkgs/scribble-pkgs/scribble-doc/info.rkt
+++ b/pkgs/scribble-pkgs/scribble-doc/info.rkt
@@ -2,7 +2,8 @@
 
 (define collection 'multi)
 
-(define build-deps '("mzscheme-doc"
+(define build-deps '("racket-index"
+                     "mzscheme-doc"
                      "net-doc"
                      "scheme-lib"
                      "draw-doc"
diff --git a/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/running.scrbl b/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/running.scrbl
index e5809182..8f31300c 100644
--- a/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/running.scrbl
+++ b/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/running.scrbl
@@ -126,6 +126,8 @@ information for all installed documentation, so
 
 renders @filepath{mine.scrbl} to @filepath{mine.html} with
 cross-reference links to the Racket installation's documentation.
+(The @filepath{racket-index} package must be installed to use
+@PFlag{m}/@DPFlag{main-xref-in}.)
 
 The @DPFlag{xref-in} flag loads cross-reference information by calling
 a specified module's function. The @racketmodname[setup/xref] module
diff --git a/pkgs/scribble-pkgs/scribble-lib/info.rkt b/pkgs/scribble-pkgs/scribble-lib/info.rkt
index 27de3c8d..c1fb2d35 100644
--- a/pkgs/scribble-pkgs/scribble-lib/info.rkt
+++ b/pkgs/scribble-pkgs/scribble-lib/info.rkt
@@ -2,7 +2,8 @@
 
 (define collection 'multi)
 
-(define deps '("scheme-lib"
+(define deps '("racket-index"
+               "scheme-lib"
                "base"
                "compatibility-lib"
                "scribble-text-lib"