diff --git a/.travis.yml b/.travis.yml
index ad87aa25..2f49c849 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -39,7 +39,7 @@ addons:
 install:
   - travis_wait 50 pip install -U -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-14.04 wxPython
   - travis_wait 50 python setup.py install
-  - pip install PyPubSub==3.3.0 pyyaml ruamel.yaml
+  - pip install PyPubSub pyyaml ruamel.yaml
 
 # command to run
 script: travis_wait 20 python devsimpy.py examples/model0.dsp 10 start quit
\ No newline at end of file
diff --git a/README.md b/README.md
index 40c7a5bd..e0ae4e17 100644
--- a/README.md
+++ b/README.md
@@ -36,20 +36,19 @@ With DEVSimPy you can:
 
 To get DEVSimPy V4.0 package with all Git submodule: 
 ```sh
-$ git clone --recurse-submodules -b version-4.0 --depth=1 https://github.com/capocchi/DEVSimPy.git .
+$ git clone --recurse-submodules -b version-4.0 --depth=1 https://github.com/capocchi/DEVSimPy.git
 $ git fetch --unshallow 
 ```
 
-DEVSimPy depends on PyPubSub version 3.3.0 (or 3.3.1), pyyaml, ruamel.yaml and modules. 
-All dependencies can be installed using requirements.txt file:
+DEVSimPy depends on PyPubSub, pyyaml, ruamel.yaml and other packages included in the requirements.txt file. 
+All dependencies can be installed using pip with the requirements.txt file:
 ```sh
 $ pip install -r requirements.txt
 ```
 For os X users, python.app is required in order to use pythonw instead of python to execute the devismpy.py file.
 
-For os X users, python.app is required in order to use pythonw instead of python to execute the devismpy.py file.
-
-DEVSimPy don't require installation and works on all platforms. To execute DEVSimPy:
+# Usage
+To execute DEVSimPy:
 ```sh
 $ python devsimpy.py
 ```
diff --git a/plugins/blink.py b/plugins/blink.py
index 9c64f4a8..aa363342 100644
--- a/plugins/blink.py
+++ b/plugins/blink.py
@@ -319,5 +319,6 @@ def OnClose(self, evt):
 		"""
 		"""
 		self.flag = True
+		self.Show(False)
 		#self.Destroy()
 		evt.Skip()
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 72576180..ccc4c218 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -59,7 +59,7 @@ wxPython >= 4.0.6
 # SimulationGUI.py: 35
 # SpreadSheet.py: 34
 # devsimpy.py: 104
-PyPubSub == 3.3.0
+PyPubSub >= 3.3.0
 
 # Mixins\Savable.py: 39
 PyYAML >= 5.1.2