diff --git a/share/man/man4/filemon.4 b/share/man/man4/filemon.4
index 2a3ddddea8ea..c0b4a51c5b4a 100644
--- a/share/man/man4/filemon.4
+++ b/share/man/man4/filemon.4
@@ -189,3 +189,8 @@ device appeared in
 Loading
 .Nm
 may reduce system performance for the noted syscalls.
+.Pp
+Only children of the set process are logged.
+Processes can escape being traced by double forking.
+This is not seen as a problem as the intended use is build monitoring, which
+does not make sense to have daemons for.