diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4838e9e..3ed6d6c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.5.1] - 2020-03-30
+## [0.5.1] - 2020-04-7
 ### Fixed
 - Bugs in post-processing modules, PR #29 [@benkrikler](github.com/benkrikler)
 
diff --git a/fast_plotter/postproc/functions.py b/fast_plotter/postproc/functions.py
index 4388a3c..5592739 100644
--- a/fast_plotter/postproc/functions.py
+++ b/fast_plotter/postproc/functions.py
@@ -206,6 +206,7 @@ def to_tuple(obj):
             return tuple(obj)
         else:
             return (obj, )
+
     axis = to_tuple(axis)
     logger.info("Splitting on axis: '%s'", axis)
     out_dfs = []