Default druid.segmentCache.announceIntervalMillis is 0 in source code, 5000 is website

Hi, all:

When I read the source code, I found in SegmentLoaderConfig.java:47, it is 0.
@JsonProperty(“announceIntervalMillis”)

private int announceIntervalMillis = 0; // do not background announce

In website, http://druid.io/docs/0.11.0/configuration/historical.html#storing-segments, its default value is 5000.

it makes me feels confused, is it a little mistake in website ?