diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 494975f..1915f69 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,12 +1,19 @@
 Changelog for h5cube
 
-v0.1.post1
+v0.1.post2 (29 Aug 2016)
+================================================================================
+
+* Improve wording of commandline help messages
+* h5cube now ignores case when identifying file extensions
+
+
+v0.1.post1 (28 Aug 2016)
 ================================================================================
 
 Administrative fix (typo in setup.py)
 
 
-v0.1
+v0.1 (28 Aug 2016)
 ================================================================================
 
 Initial beta release, without documentation or a test suite. Below functionality
diff --git a/README.rst b/README.rst
index 38ad5ea..d4e64d7 100644
--- a/README.rst
+++ b/README.rst
@@ -5,6 +5,9 @@ Compression/decompression command-line tool and Python package for
 Gaussian CUBE files, exploiting the capabilities of the
 `HDF5 <http://www.h5py.org/>`__ binary format via ``h5py``.
 
+Branches named with the prefix ``v.`` are volatile. The history
+there may be rewritten dramatically, without warning.
+
 Available on `PyPI <https://pypi.python.org/pypi/h5cube>`__
 (``pip install h5cube``).
 
diff --git a/doc/source/conf.py b/doc/source/conf.py
index f1f2ba8..311b27e 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -67,7 +67,7 @@
 # The short X.Y version.
 version = '0.1'
 # The full version, including alpha/beta/rc tags.
-release = '0.1.post1'
+release = '0.1.post2'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/h5cube/__init__.py b/h5cube/__init__.py
index 8a1dc67..88ac510 100644
--- a/h5cube/__init__.py
+++ b/h5cube/__init__.py
@@ -18,5 +18,5 @@
 
 from .h5cube import cube_to_h5, h5_to_cube, H5, EXIT
 
-__version__ = '0.1.post1'
+__version__ = '0.1.post2'
 
diff --git a/h5cube/h5cube.py b/h5cube/h5cube.py
index e45d352..b99985e 100644
--- a/h5cube/h5cube.py
+++ b/h5cube/h5cube.py
@@ -349,7 +349,13 @@ def _get_parser():
 
     # Argument for the filename (core parser)
     prs.add_argument(AP.PATH, action='store',
-                     help="path to .(h5)cube file to be (de)compressed")
+                     help="path to file to be (de)compressed, where "
+                          "the operation to be performed is hard coded based "
+                          "on the file extension: .cub/.cube files are "
+                          "compressed to .h5cube, .h5cube files are "
+                          "decompressed to .cube, and "
+                          "the program exits with an error "
+                          "on any other extension")
 
     # Argument to delete the source file; default is to keep (core)
     prs.add_argument('-{0}'.format(AP.DELETE[0]), '--{0}'.format(AP.DELETE),
@@ -369,10 +375,12 @@ def _get_parser():
     gp_comp.add_argument('-{0}'.format(AP.TRUNC[0]),
                          '--{0}'.format(AP.TRUNC),
                          action='store', default=None, type=int,
-                         choices=list(range(1,16)),
+                         choices=list(range(16)),
                          metavar='#',
-                         help="gzip truncation width for volumetric "
-                              "data (1-15, default {0})".format(DEF.TRUNC))
+                         help="h5py scale-offset filter truncation width "
+                              "for volumetric "
+                              "data (number of mantissa digits retained; "
+                              "0-15, default {0})".format(DEF.TRUNC))
 
     # Absolute thresholding mode (compress -- threshold mode)
     meg_threshmode.add_argument('-{0}'.format(AP.ABSMODE[0]),
@@ -405,7 +413,8 @@ def _get_parser():
                                 nargs=2,
                                 metavar='#',
                                 help="min and max values for "
-                                     "threshold specification")
+                                     "threshold specification (provide as "
+                                     "-m [min] [max])")
 
     # Isovalue/factor threshold specification (compress -- threshold values)
     meg_threshvals.add_argument('-{0}'.format(AP.ISOFACTOR[0]),
@@ -416,7 +425,9 @@ def _get_parser():
                                 metavar='#',
                                 help="Isovalue and multiplicative "
                                      "factor values for "
-                                     "threshold specification")
+                                     "threshold specification (e.g., "
+                                     "'-i 0.002 4' corresponds to "
+                                     "'-m 0.0005 0.008')")
 
     # Data block output precision (decompress)
     gp_decomp.add_argument('-{0}'.format(AP.PREC[0]),
@@ -500,7 +511,7 @@ def notNoneFalse(x):
         sys.exit(EXIT.CMDLINE)
 
     # Check file extension as indication of execution mode
-    if ext == '.h5cube':
+    if ext.lower() == '.h5cube':
         # Decompression mode
         if compargs:
             print("Error: compression arguments passed to "
@@ -509,7 +520,7 @@ def notNoneFalse(x):
 
         h5_to_cube(path, delsrc=delsrc, prec=prec)
 
-    elif ext in ['.cube', '.cub']:
+    elif ext.lower() in ['.cube', '.cub']:
         # Compression mode
         if decompargs:
             print("Error: decompression arguments passed to "
diff --git a/setup.py b/setup.py
index d6255ae..37dda53 100644
--- a/setup.py
+++ b/setup.py
@@ -2,9 +2,9 @@
 
 setup(
     name='h5cube',
-    version='0.1.post1',
+    version='0.1.post2',
     provides=['h5cube'],
-    requires=['h5py (>=2.4)'],
+    requires=['h5py (>=2.4)', 'numpy (>=1.6.1)'],
     packages=['h5cube'],
     url='https://www.github.com/bskinn/h5cube',
     license='MIT License',
@@ -17,10 +17,9 @@
                  'Intended Audience :: Science/Research',
                  'Operating System :: OS Independent',
                  'Programming Language :: Python :: 3 :: Only',
-#                 'Programming Language :: Python :: 3.2',
-#                 'Programming Language :: Python :: 3.3',
-#                 'Programming Language :: Python :: 3.4',
-#                 'Programming Language :: Python :: 3.5',
+                 'Programming Language :: Python :: 3.3',
+                 'Programming Language :: Python :: 3.4',
+                 'Programming Language :: Python :: 3.5',
                  'Topic :: Scientific/Engineering',
                  'Topic :: System :: Archiving :: Compression',
                  'Topic :: Utilities',