diff --git a/src/trimage/trimage.py b/src/trimage/trimage.py
index 3033740..786fd2b 100755
--- a/src/trimage/trimage.py
+++ b/src/trimage/trimage.py
@@ -230,6 +230,7 @@ class StartQT4(QMainWindow):
         return status
 
     def safe_call(self, command):
+        """ cross-platform command-line check """
         while True:
             try:
                 return call(command, shell=True, stdout=PIPE)
diff --git a/src/trimage/ui.py b/src/trimage/ui.py
index 6f4ec81..d644299 100644
--- a/src/trimage/ui.py
+++ b/src/trimage/ui.py
@@ -28,10 +28,12 @@ class TrimageTableView(QTableView):
 
 class Ui_trimage(object):
     def get_image(self, image):
+        """ Get the correct link to the images used in the UI """
         imagelink = path.join(path.dirname(path.dirname(path.realpath(__file__))), "trimage/" + image)
         return imagelink
 
     def setupUi(self, trimage):
+        """ Setup the entire UI """
         trimage.setObjectName("trimage")
         trimage.resize(600, 170)
         trimage.setWindowIcon(QIcon(self.get_image("pixmaps/trimage-icon.png")))
@@ -137,6 +139,7 @@ class Ui_trimage(object):
         QMetaObject.connectSlotsByName(trimage)
 
     def retranslateUi(self, trimage):
+        """ Fill in the texts for all UI elements """
         trimage.setWindowTitle(QApplication.translate("trimage",
             "Trimage image compressor", None, QApplication.UnicodeUTF8))
         self.addfiles.setToolTip(QApplication.translate("trimage",