diff --git a/CHANGES.md b/CHANGES.md
index d28c6a5..52b7645 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.9.3
+- Improved bash minify for user-data
+- Unused additional parameters are now printed as a warning to catch potential typos early
+
 ## 0.9.2
 - Bug fix release only
 
diff --git a/cloudbender/__init__.py b/cloudbender/__init__.py
index 4994076..9ab824e 100644
--- a/cloudbender/__init__.py
+++ b/cloudbender/__init__.py
@@ -2,7 +2,7 @@ import logging
 
 __author__ = "Stefan Reimer"
 __email__ = "stefan@zero-downtimet.net"
-__version__ = "0.9.2"
+__version__ = "0.9.3"
 
 
 # Set up logging to ``/dev/null`` like a library is supposed to.
diff --git a/cloudbender/jinja.py b/cloudbender/jinja.py
index 5ad136b..c4797d1 100644
--- a/cloudbender/jinja.py
+++ b/cloudbender/jinja.py
@@ -51,6 +51,9 @@ def option(context, attribute, default_value=u'', source='options'):
 def include_raw_gz(context, files=None, gz=True, remove_comments=False):
     jenv = context.environment
     output = ''
+
+    # For shell script we can even remove whitespaces so treat them individually
+    # sed -e '2,$ {/^ *$/d ; /^ *#/d ; /^[ \t] *#/d ; /*^/d ; s/^[ \t]*// ; s/*[ \t]$// ; s/ $//}'
     for name in files:
         output = output + jinja2.Markup(jenv.loader.get_source(jenv, name)[0])
 
diff --git a/cloudbender/stack.py b/cloudbender/stack.py
index aa34b31..7d8aa23 100644
--- a/cloudbender/stack.py
+++ b/cloudbender/stack.py
@@ -452,8 +452,17 @@ class Stack(object):
             if _errors:
                 raise ParameterNotFound('Cannot find value for parameters: {0}'.format(_errors))
 
+            # Warning of excessive parameters, might be useful to spot typos early
+            _warnings = []
+            for p in self.parameters.keys():
+                if p not in self.cfn_data['Parameters']:
+                    _warnings.append(p)
+
             logger.info('{} {} set parameters:\n{}'.format(self.region, self.stackname, pprint.pformat(_found, indent=2)))
 
+            if _warnings:
+                logger.warning('Ignored additional parameters: {}.'.format(_warnings))
+
         # Return dict of explicitly set parameters
         return _found
 
diff --git a/cloudbender/utils.py b/cloudbender/utils.py
index 4c4fb34..9594bc4 100644
--- a/cloudbender/utils.py
+++ b/cloudbender/utils.py
@@ -1,7 +1,6 @@
 import os
 import copy
 import logging
-import boto3
 
 logger = logging.getLogger(__name__)