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-rw-r--r--doc/doc-docbook/spec.xfpt3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 1ab2bba0a..1bc2028d5 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -16885,6 +16885,9 @@ generates any deliveries to files or pipes, or any new mail messages, the
appropriate &%system_filter_..._transport%& option(s) must be set, to define
which transports are to be used. Details of this facility are given in chapter
&<<CHAPsystemfilter>>&.
+.new
+A forced expansion failure results in no filter operation.
+.wen
.option system_filter_directory_transport main string&!! unset