diff --git a/pyfolio/check_inputs.py b/pyfolio/check_inputs.py
deleted file mode 100644
index 599802dd..00000000
--- a/pyfolio/check_inputs.py
+++ /dev/null
@@ -1,118 +0,0 @@
-#
-# Copyright 2017 Quantopian, Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-from __future__ import division
-
-import engarde.checks as ed
-
-
-class TearSheetInputError(Exception):
-    """Custom Exception for pyfolio input errors"""
-    pass
-
-
-def check_inputs(returns,
-                 positions,
-                 txns):
-    """
-    Check inputs to create_foo_tear_sheet functions
-
-    - Raises a TearSheetInputError if inputs violate specification
-    """
-    check_returns(returns)
-    check_positions(positions)
-    check_txns(txns)
-
-
-def check_returns(returns):
-    """
-    Check returns for specification
-
-    - There must not be NaNs
-    - Index must be timezone-localized datetimes
-    - Returns must be floats
-    """
-    try:
-        ed.none_missing(returns)
-    except AssertionError as e:
-        raise TearSheetInputError('''returns has NaNs. engarde raises the
-                                  following: ''' + e)
-
-    if returns.index.tz is None:
-        raise TearSheetInputError('returns index is not timezone-localized')
-
-    if returns.dtype != float:
-        raise TearSheetInputError('returns data types are not all float')
-
-def check_positions(positions):
-    """
-    Check positions for specification
-
-    - There must not be any NaNs
-    - Index must be timezone-localized datetimes
-    - There must a column called 'cash'
-    - Positions must be floats
-    """
-    try:
-        ed.none_missing(positions)
-    except AssertionError as e:
-        raise TearSheetInputError('''positions has NaNs. engarde raises the
-                                  following: ''' + e)
-
-    if positions.index.tz is None:
-        raise TearSheetInputError('positions index is not timezone-localized')
-
-    if 'cash' not in positions.columns:
-        raise TearSheetInputError('positions does not have a cash column')
-
-    if not all(positions.apply(lambda col: col.dtype, axis='columns') == float):
-        raise TearSheetInputError('''positions data types are not all float''')
-
-
-def check_txns(txns):
-    """
-    Check transactions for specification
-
-    - There must not be any NaNs
-    - Index must be timezone-localized datetimes
-    - There must be columns called 'amount', 'price', and 'symbol'
-    - Amounts must be ints
-    - Prices must be floats
-    - Symbols must be strings
-    """
-    try:
-        ed.none_missing(txns)
-    except AssertionError as e:
-        raise TearSheetInputError('''transactions has NaNs. engarde raises the
-                                  following: ''' + e)
-
-    if txns.index.tz is None:
-        raise TearSheetInputError('''transactions index is not
-                                  timezone-localized''')
-
-    if all([col in txns.columns for col in ['amount',
-                                            'price',
-                                            'symbol']]) == False:
-        raise TearSheetInputError('''transactions does not have correct columns.
-                                  Columns must be "amount", "price" and
-                                  "symbol"''')
-
-    try:
-        ed.has_dtypes(txns, {'amount': int;
-                             'price': float;
-                             'symbol': str})
-    except AssertionError as e:
-        raise TearSheetInputError('''transactions columns do not have correct
-                                  data types. engarde raises the following: '''
-                                  + e)
diff --git a/pyfolio/tears.py b/pyfolio/tears.py
index edce62d3..47f52521 100644
--- a/pyfolio/tears.py
+++ b/pyfolio/tears.py
@@ -98,7 +98,7 @@ def create_full_tear_sheet(returns,
     positions : pd.DataFrame, optional
         Daily net position values.
          - Time series of dollar amount invested in each position and cash.
-         - Days where stocks are not held must be represented by 0.
+         - Days where stocks are not held can be represented by 0 or NaN.
          - Non-working capital is labelled 'cash'
          - Example:
             index         'AAPL'         'MSFT'          cash
@@ -109,7 +109,7 @@ def create_full_tear_sheet(returns,
         Executed trade volumes and fill prices.
         - One row per trade.
         - Trades on different names that occur at the
-          same time will have identical indices.
+          same time will have identical indicies.
         - Example:
             index                  amount   price    symbol
             2004-01-09 12:18:01    483      324.12   'AAPL'