diff --git a/docs/sphinx/source/whatsnew/v0.5.1.rst b/docs/sphinx/source/whatsnew/v0.5.1.rst
index f1ef0be9be..992a7aad3d 100644
--- a/docs/sphinx/source/whatsnew/v0.5.1.rst
+++ b/docs/sphinx/source/whatsnew/v0.5.1.rst
@@ -1,26 +1,13 @@
 .. _whatsnew_0510:
 
-v0.5.1 (?, 2017)
-------------------------
+v0.5.1 (October 17, 2017)
+-------------------------
 
 API Changes
 ~~~~~~~~~~~
-*
-
-Bug fixes
-~~~~~~~~~
-* Remove condition causing Overflow warning from clearsky.haurwitz
-* modelchain.basic_chain now correctly passes 'solar_position_method'
-  arg to solarposition.get_solarposition
-* Fixed: `Variables and Symbols extra references not available <https://github.com/pvlib/pvlib-python/issues/380>`_
-* Removed unnecessary calculations of alpha_prime in spa.solar_position_numpy
-  and spa.solar_position_loop
-* Fixed args mismatch for solarposition.pyephem call 
-  from solarposition.get_solarposition with method='pyephem'
-  arg to solarposition.get_solarposition (:issue:`370`)
-* ModelChain.prepare_inputs and ModelChain.complete_irradiance now
-  correctly pass the 'solar_position_method' argument to
-  solarposition.get_solarposition (:issue:`377`)
+* `pvsystem.v_from_i` and `pvsystem.i_from_v` functions now accept
+  resistance_series = 0 and/or resistance_shunt = numpy.inf as inputs
+  (:issue:`340`)
 
 Enhancements
 ~~~~~~~~~~~~
@@ -32,18 +19,30 @@ Enhancements
   resistance_series and/or resistance_shunt may still cause issues with the
   implicit solver (:issue:`340`)
 
-API Changes
-~~~~~~~~~~~
-* `pvsystem.v_from_i` and `pvsystem.i_from_v` functions now accept
-  resistance_series = 0 and/or resistance_shunt = numpy.inf as inputs
-  (:issue:`340`)
+Bug fixes
+~~~~~~~~~
+* Remove condition causing Overflow warning from clearsky.haurwitz
+  (:issue:`363`)
+* modelchain.basic_chain now correctly passes 'solar_position_method'
+  arg to solarposition.get_solarposition (:issue:`370`)
+* Fixed: `Variables and Symbols extra references not available
+  <https://github.com/pvlib/pvlib-python/issues/380>`_ (:issue:`380`)
+* Removed unnecessary calculations of alpha_prime in spa.solar_position_numpy
+  and spa.solar_position_loop (:issue:`366`)
+* Fixed args mismatch for solarposition.pyephem call
+  from solarposition.get_solarposition with method='pyephem'
+  arg to solarposition.get_solarposition (:issue:`370`)
+* ModelChain.prepare_inputs and ModelChain.complete_irradiance now
+  correctly pass the 'solar_position_method' argument to
+  solarposition.get_solarposition (:issue:`377`)
+* Fixed usage of inplace parameter for tmy._recolumn (:issue:`342`)
 
 Documentation
 ~~~~~~~~~~~~~
 * Doc string of modelchain.basic_chain was updated to describe args
-  more accurately
+  more accurately. (:issue:`370`)
 * Doc strings of `singlediode`, `pvsystem.v_from_i`, and `pvsystem.i_from_v`
-  were updated to describe acceptable input arg ranges
+  were updated to describe acceptable input arg ranges. (:issue:`340`)
 
 Testing
 ~~~~~~~
@@ -57,3 +56,4 @@ Contributors
 * KonstantinTr
 * Will Holmgren
 * Mark Campanelli
+* DaCoEx
diff --git a/pvlib/tmy.py b/pvlib/tmy.py
index 833ecdd220..111f2bab91 100644
--- a/pvlib/tmy.py
+++ b/pvlib/tmy.py
@@ -187,7 +187,7 @@ def readtmy3(filename=None, coerce_year=None, recolumn=True):
         index_col='datetime')
 
     if recolumn:
-        _recolumn(data)  # rename to standard column names
+        data = _recolumn(data)  # rename to standard column names
 
     data = data.tz_localize(int(meta['TZ']*3600))
 
@@ -213,7 +213,7 @@ def _parsedate(ymd, hour, year=None):
     return true_date
 
 
-def _recolumn(tmy3_dataframe, inplace=True):
+def _recolumn(tmy3_dataframe):
     """
     Rename the columns of the TMY3 DataFrame.
 
@@ -251,7 +251,7 @@ def _recolumn(tmy3_dataframe, inplace=True):
 
     mapping = dict(zip(raw_columns.split(','), new_columns))
 
-    return tmy3_dataframe.rename(columns=mapping, inplace=True)
+    return tmy3_dataframe.rename(columns=mapping)
 
 
 def readtmy2(filename):