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diff --git a/doc/apt.8 b/doc/apt.8
index eafd4d7ec..8fb61c8b0 100644
--- a/doc/apt.8
+++ b/doc/apt.8
@@ -31,6 +31,7 @@ None.
 .SH SEE ALSO
 .BR apt-cache (8),
 .BR apt-get (8),
+.BR apt.conf (5),
 .BR sources.list (5)
 .SH DIAGNOSTICS
 apt returns zero on normal operation, decimal 100 on error.