diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
index 6ab361714ec1..7f72996789e4 100644
--- a/lib/matplotlib/dates.py
+++ b/lib/matplotlib/dates.py
@@ -71,6 +71,10 @@
 
 Here are all the date tickers:
 
+    * :class:`MicrosecondLocator`: locate microseconds
+
+    * :class:`SecondLocator`: locate seconds
+
     * :class:`MinuteLocator`: locate minutes
 
     * :class:`HourLocator`: locate hours
@@ -794,6 +798,9 @@ def __setstate__(self, state):
 class DateLocator(ticker.Locator):
     """
     Determines the tick locations when plotting dates.
+
+    This class is subclassed by other Locators and
+    is not meant to be used on its own.
     """
     hms0d = {'byhour': 0, 'byminute': 0, 'bysecond': 0}