1 files changed, 9 insertions, 0 deletions

diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index 52caed0..60159f6 100644
--- a/cgitrc.5.txt
+++ 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