diff --git a/doc/Changelog b/doc/Changelog
index f99103811..2a8d8bf6c 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,3 +1,6 @@
+24 March 2016: Wouter
+	- Document permit-small-holddown for 5011 debug.
+
 23 March 2016: Wouter
 	- OpenSSL 1.1.0 portability, --disable-dsa configure option.
 
diff --git a/doc/example.conf.in b/doc/example.conf.in
index 71b9c764f..8ccb90875 100644
--- a/doc/example.conf.in
+++ b/doc/example.conf.in
@@ -464,7 +464,8 @@ server:
 	# If the value 0 is given, missing anchors are not removed.
 	# keep-missing: 31622400 # 366 days
 
-	# debug option that allows very small holddown times for key rollover
+	# debug option that allows very small holddown times for key rollover,
+	# otherwise the RFC mandates probe intervals must be at least 1 hour.
 	# permit-small-holddown: no
 
 	# the amount of memory to use for the key cache.