Added details of ex-dates.

Author: brotchie

pandas_datareader/data.py

@@ -58,7 +58,7 @@ def DataReader(name, data_source=None, start=None, end=None,
     # Data from Yahoo! Finance
     gs = DataReader("GS", "yahoo")
 
-    # Corporate Actions (Dividend and Split Data) from Yahoo! Finance
+    # Corporate Actions (Dividend and Split Data) with ex-dates from Yahoo! Finance
     gs = DataReader("GS", "yahoo-actions")
 
     # Data from Google Finance
@@ -436,7 +436,8 @@ def get_data_yahoo_actions(symbol, start=None, end=None, retry_count=3,
                    pause=0.001):
   """
   Returns DataFrame of historical corporate actions (dividends and stock
-  splits) from symbols, over date range, start to end.
+  splits) from symbols, over date range, start to end. All dates in the
+  resulting DataFrame correspond with dividend and stock split ex-dates.
 
   Parameters
   ----------