diff --git a/pyblock/pd_utils.py b/pyblock/pd_utils.py
index e5704ce..570e24c 100644
--- a/pyblock/pd_utils.py
+++ b/pyblock/pd_utils.py
@@ -118,7 +118,7 @@ def optimal_block(block_sub_info):
     Parameters
     ----------
     block_sub_info: :class:`pandas.DataFrame` or :class:`pandas.Series`
-        Reblocking data (i.e. the first item of the tuple returned by ``reblock``),
+        Reblocking data (i.e. the second item of the tuple returned by ``reblock``),
         or a subset thereof containing the statistics columns for one or more data
         items.
 
@@ -180,7 +180,7 @@ def reblock_summary(block_sub_info):
     Parameters
     ----------
     block_sub_info : :class:`pandas.DataFrame` or :class:`pandas.Series`
-        Reblocking data (i.e. the first item of the tuple returned by ``reblock``),
+        Reblocking data (i.e. the second item of the tuple returned by ``reblock``),
         or a subset thereof containing the statistics columns for one or more data
         items.
 
diff --git a/pyblock/plot.py b/pyblock/plot.py
index 6679876..e168111 100644
--- a/pyblock/plot.py
+++ b/pyblock/plot.py
@@ -12,7 +12,7 @@ def plot_reblocking(block_info, plotfile=None, plotshow=True):
     Parameters
     ----------
     block_info : :class:`pandas.DataFrame`
-        Reblocking data (i.e. the first item of the tuple returned by ``reblock``).
+        Reblocking data (i.e. the second item of the tuple returned by ``reblock``).
     plotfile : string
         If not null, save the plot to the given filename.  If '-', then show the
         plot interactively.  See also ``plotshow``.