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diff --git a/cgitrc.5.txt b/cgitrc.5.txt
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+++ b/cgitrc.5.txt
@@ -557,6 +557,15 @@ config files, e.g. "repo.desc" becomes "desc".
FILTER API
----------
+By default, filters are separate processes that are executed each time they
+are needed. Alternative technologies may be used by prefixing the filter
+specification with the relevant string; available values are:
+
+'exec:'::
+ The default "one process per filter" mode.
+
+Parameters are provided to filters as follows.
+
about filter::
This filter is given a single parameter: the filename of the source
file to filter. The filter can use the filename to determine (for