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diff --git a/toc/toc.1 b/toc/toc.1
index dbee298..413a206 100644
--- a/toc/toc.1
+++ b/toc/toc.1
@@ -19,6 +19,9 @@ from the end of the document to the beginning.
As arguments, it takes a
.Xr troff 1
command line, which is evaluated as a shell command on each pass.
+If the command line is a pipeline,
+.Xr troff 1
+must be the final command.
.Pp
.Nm
runs