diff --git a/README.rst b/README.rst
index 2e63347..e4dae81 100644
--- a/README.rst
+++ b/README.rst
@@ -119,9 +119,10 @@ Running unit tests
 Running acceptance tests
 ------------------------
 
-Additionally to unit test dependencies, you also need OpenCV, Eel and Chrome/Chromium browser.
+Additionally to unit test dependencies, you also need OpenCV, Eel, scrot and Chrome/Chromium browser.
 OpenCV is used because this tests are testing also confidence level.
 Browser is used by Eel for cross-platform GUI demo application.
+scrot is used for capturing screenshots.
 
 ::
     $ pip install opencv-python eel
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..c2d7a6f
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,5 @@
+[bdist_wheel]
+universal = 1
+
+[metadata]
+license_files = LICENSE
diff --git a/src/ImageHorizonLibrary/recognition/_recognize_images.py b/src/ImageHorizonLibrary/recognition/_recognize_images.py
index e4b8248..b2ed9d5 100644
--- a/src/ImageHorizonLibrary/recognition/_recognize_images.py
+++ b/src/ImageHorizonLibrary/recognition/_recognize_images.py
@@ -178,7 +178,8 @@ def try_locate(ref_image):
                     else:
                         if self.confidence:
                             LOGGER.warn("Can't set confidence because you don't "
-                                        "have OpenCV (python-opencv) installed.")
+                                        "have OpenCV (python-opencv) installed "
+                                        "or a confidence level was not given.")
                         location = ag.locateOnScreen(ref_image)
                 except ImageNotFoundException as ex:
                     LOGGER.info(ex)