diff --git a/MAINTAINER_NOTES b/MAINTAINER_NOTES
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+Externally generated pages
+==========================
+
+A few pages come from external sources. Fixes to the pages should really
+go to the upstream source.
+
+tzfile(5), zdump(8), and zic(8) come from the tz project
+(https://www.iana.org/time-zones).
+
+bpf-helpers(7) is autogenerated from the kernel sources using scripts.
+See man-pagfes commit 53666f6c30451cde022f65d35a8d448f5a7132ba dir
+details.