M docs/hfcs.1 → docs/hfcs.1

@@ -81,6 +81,11 @@ The
 .Ar replace
 text may refer to submatches using $1, etc.
 .Pp
+A post marked sensitive that does not otherwise contain a summary will
+have an invisible summary of
+.Dq unspecified horror
+that can be matched against and will appear if the post is collapsed.
+.Pp
 An optional expiration may be specified as a duration.
 XdYhZm for X days, Y hours, and Z minutes.
 .Sh SEE ALSO