--- a/doc/manual.tex	Sun Apr 29 13:17:31 2012 -0400
+++ b/doc/manual.tex	Sun Apr 29 16:23:03 2012 -0400
@@ -211,6 +211,18 @@
 \end{verbatim}
 The first output line is a list of categories of CSS properties that would be worth setting on the document body.  The remaining lines are space-separated pairs of CSS class names and categories of properties that would be worth setting for that class.  The category codes are divided into two varieties.  Codes that reveal properties of a tag or its (recursive) children are \cd{B} for block-level elements, \cd{C} for table captions, \cd{D} for table cells, \cd{L} for lists, and \cd{T} for tables.  Codes that reveal properties of the precise tag that uses a class are \cd{b} for block-level elements, \cd{t} for tables, \cd{d} for table cells, \cd{-} for table rows, \cd{H} for the possibility to set a height, \cd{N} for non-replaced inline-level elements, \cd{R} for replaced inline elements, and \cd{W} for the possibility to set a width.
 
+Ur/Web type inference can take a significant amount of time, so it can be helpful to cache type-inferred versions of source files.  This mode can be activated by running
+\begin{verbatim}
+urweb daemon start
+\end{verbatim}
+Further \cd{urweb} invocations in the same working directory will send requests to a background daemon process that reuses type inference results whenever possible, tracking source file dependencies and modification times.  To stop the background daemon, run
+\begin{verbatim}
+urweb daemon stop
+\end{verbatim}
+Communication happens via a UNIX domain socket in file \cd{.urweb\_daemon} in the working directory.
+
+\medskip
+
 Some other command-line parameters are accepted:
 \begin{itemize}
 \item \texttt{-db <DBSTRING>}: Set database connection information, using the format expected by Postgres's \texttt{PQconnectdb()}, which is \texttt{name1=value1 ... nameN=valueN}.  The same format is also parsed and used to discover connection parameters for MySQL and SQLite.  The only significant settings for MySQL are \texttt{host}, \texttt{hostaddr}, \texttt{port}, \texttt{dbname}, \texttt{user}, and \texttt{password}.  The only significant setting for SQLite is \texttt{dbname}, which is interpreted as the filesystem path to the database.  Additionally, when using SQLite, a database string may be just a file path.