diff --git a/invesalius/data/viewer_slice.py b/invesalius/data/viewer_slice.py
index 24ad9c3..af632ba 100755
--- a/invesalius/data/viewer_slice.py
+++ b/invesalius/data/viewer_slice.py
@@ -62,20 +62,32 @@ class ContourMIPConfig(wx.Panel):
         wx.Panel.__init__(self, prnt)
         self.mip_size_spin = wx.SpinCtrl(self, -1, min=1, max=240,
                                          initial=const.PROJECTION_MIP_SIZE)
+        self.mip_size_spin.SetToolTip(wx.ToolTip(_("Number of slices used to compound the visualization")))
         w, h = self.mip_size_spin.GetTextExtent('M')
         self.mip_size_spin.SetMinSize((4 * w + 10, -1))
         self.mip_size_spin.SetMaxSize((4 * w + 10, -1))
+
         self.border_spin = FS.FloatSpin(self, -1, min_val=0, max_val=10,
                                         increment=0.1,
                                         value=const.PROJECTION_BORDER_SIZE,
                                         digits=1, agwStyle=FS.FS_LEFT)
+        self.border_spin.SetToolTip(wx.ToolTip(_("Controls the sharpness of the"
+                                                 " contour. The greater the"
+                                                 " value, the sharper the"
+                                                 " contour")))
         w, h = self.border_spin.GetTextExtent('M')
         self.border_spin.SetMinSize((5 * w + 10, -1))
         self.border_spin.SetMaxSize((5 * w + 10, -1))
+
         self.inverted = wx.CheckBox(self, -1, "inverted")
+        self.inverted.SetToolTip(wx.ToolTip(_("If checked, the slices are"
+                                              " traversed in descending"
+                                              " order to compound the"
+                                              " visualization instead of"
+                                              " ascending order")))
         
-        txt_mip_size = wx.StaticText(self, -1, "MIP size", style=wx.ALIGN_CENTER_HORIZONTAL)
-        self.txt_mip_border = wx.StaticText(self, -1, "Border") 
+        txt_mip_size = wx.StaticText(self, -1, "Number of slices", style=wx.ALIGN_CENTER_HORIZONTAL)
+        self.txt_mip_border = wx.StaticText(self, -1, "Sharpness") 
 
         sizer = wx.BoxSizer(wx.HORIZONTAL)
         sizer.Add(txt_mip_size, 0, wx.EXPAND | wx.ALL, 2)
--
libgit2 0.21.2