@@ -6,10 +6,11 @@
 @(require "scribble-helpers.rkt"
           scribble/example)
 
 @(require (for-label "../pollen.rkt"
                      "../dust.rkt"
+                     "../cache.rkt"
                      racket/base
                      racket/contract
                      txexpr
                      sugar/coerce
                      pollen/tag
@@ -18,11 +19,11 @@
                      pollen/core))
 
 @(define dust-eval (make-base-eval))
 @(dust-eval '(require "dust.rkt" txexpr))
 
-@title{@filepath{dust.rkt}}
+@title{Dust}
 
 @defmodule["dust.rkt" #:packages ()]
 
 This is where I put constants and helper functions that are needed pretty much everywhere in the
 project. In a simpler project these would go in @seclink["pollen-rkt"]{@filepath{pollen.rkt}} but
@@ -142,18 +143,26 @@
 (first-words txs-parens-commas 5)
 (first-words txs-short 5)
 ]
 
 @section{Article parsers and helpers}
+
+@defparam[listing-context ctxt (or/c 'blog 'feed 'print "") #:value ""]
+
+A parameter specifying the current context where any listings of articles would appear. Its purpose
+is to allow articles to exclude themselves from certain special collections (e.g., the blog, the RSS
+feed, print editions). Any article whose @code{conceal} meta matches the current context will not be
+included in any listings returned by the listing functions in
+@seclink["cache-rkt"]{@filepath{cache.rkt}}.
 
 @defproc[(default-title [body-txprs (listof txexpr?)]) string?]
 
 Given a list of tagged X-expressions (the elements of an article’s doc, e.g.), returns a string
 containing a suitable title for the document. (Uses @racket[first-words].)
 
-Titles are not required for articles, but there are contexts where you need something that
-serves as a title if one is not present, and that’s what this function supplies.
+Titles are not required for articles, but there are contexts where you need something that serves as
+a title if one is not present, and that’s what this function supplies.
 
 @examples[#:eval dust-eval
 (define doc 
   '(root (p "If I had been astonished at first catching a glimpse of so outlandish an "
             "individual as Queequeg circulating among the polite society of a civilized "