diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
index 0e2fb3ab0dd..505d823daf2 100644
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -38,6 +38,7 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20190518: Remove obsolete 10 and 10/100 ethernet drivers.
 # 20190513: libcap_sysctl interface change
 OLD_FILES+=lib/casper/libcap_sysctl.1
 # 20190509: tests/sys/opencrypto requires the net/py-dpkt package.