diff --git a/gui/builtinGraphs/base.py b/gui/builtinGraphs/base.py
index 6de45d164..5211b516b 100644
--- a/gui/builtinGraphs/base.py
+++ b/gui/builtinGraphs/base.py
@@ -35,7 +35,7 @@ VectorDef = namedtuple('VectorDef', ('lengthHandle', 'lengthUnit', 'angleHandle'
 
 class Input:
 
-    def __init__(self, handle, unit, label, iconID, defaultValue, defaultRange, mainOnly=False, valueTt=None, rangeTt=None):
+    def __init__(self, handle, unit, label, iconID, defaultValue, defaultRange, mainOnly=False, mainTooltip=None, secondaryTooltip=None):
         self.handle = handle
         self.unit = unit
         self.label = label
@@ -43,8 +43,8 @@ class Input:
         self.defaultValue = defaultValue
         self.defaultRange = defaultRange
         self.mainOnly = mainOnly
-        self.valueTt = valueTt
-        self.rangeTt = rangeTt
+        self.mainTooltip = mainTooltip
+        self.secondaryTooltip = secondaryTooltip
 
 
 class FitGraph(metaclass=ABCMeta):
diff --git a/gui/builtinGraphs/fitDamageStats/graph.py b/gui/builtinGraphs/fitDamageStats/graph.py
index 31ec25430..accfa57c4 100644
--- a/gui/builtinGraphs/fitDamageStats/graph.py
+++ b/gui/builtinGraphs/fitDamageStats/graph.py
@@ -69,7 +69,7 @@ class FitDamageStatsGraph(FitGraph):
         YDef(handle='volley', unit=None, label='Volley'),
         YDef(handle='damage', unit=None, label='Damage inflicted')]
     inputs = [
-        Input(handle='time', unit='s', label='Time', iconID=1392, defaultValue=None, defaultRange=(0, 80)),
+        Input(handle='time', unit='s', label='Time', iconID=1392, defaultValue=None, defaultRange=(0, 80), secondaryTooltip='When set, uses exact damage stats at a given time\nWhen not set, uses damage stats as shown in stats panel of main window'),
         Input(handle='distance', unit='km', label='Distance', iconID=1391, defaultValue=50, defaultRange=(0, 100)),
         Input(handle='tgtSpeed', unit='%', label='Target speed', iconID=1389, defaultValue=100, defaultRange=(0, 100)),
         Input(handle='tgtSigRad', unit='%', label='Target signature', iconID=1390, defaultValue=100, defaultRange=(100, 200), mainOnly=True)]
diff --git a/gui/graphFrame/panel.py b/gui/graphFrame/panel.py
index 3a4130dc0..8c1067928 100644
--- a/gui/graphFrame/panel.py
+++ b/gui/graphFrame/panel.py
@@ -217,11 +217,13 @@ class GraphControlPanel(wx.Panel):
         def addInputField(inputDef, handledHandles, mainInput=False):
             handledHandles.add(inputDef.handle)
             fieldSizer = wx.BoxSizer(wx.HORIZONTAL)
+            tooltipText = (inputDef.mainTooltip if mainInput else inputDef.secondaryTooltip) or ''
             if mainInput:
                 fieldTextBox = FloatRangeBox(self, self._storedRanges.get((inputDef.handle, inputDef.unit), inputDef.defaultRange))
             else:
                 fieldTextBox = FloatBox(self, self._storedConsts.get((inputDef.handle, inputDef.unit), inputDef.defaultValue))
             fieldTextBox.Bind(wx.EVT_TEXT, self.OnFieldChanged)
+            fieldTextBox.SetToolTip(wx.ToolTip(tooltipText))
             fieldSizer.Add(fieldTextBox, 0, wx.EXPAND | wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 5)
             fieldIcon = None
             if inputDef.iconID is not None:
@@ -229,8 +231,10 @@ class GraphControlPanel(wx.Panel):
                 if icon is not None:
                     fieldIcon = wx.StaticBitmap(self)
                     fieldIcon.SetBitmap(icon)
+                    fieldIcon.SetToolTip(wx.ToolTip(tooltipText))
                     fieldSizer.Add(fieldIcon, 0, wx.ALIGN_CENTER_VERTICAL | wx.RIGHT, 3)
             fieldLabel = wx.StaticText(self, wx.ID_ANY, self.formatLabel(inputDef))
+            fieldLabel.SetToolTip(wx.ToolTip(tooltipText))
             fieldSizer.Add(fieldLabel, 0, wx.ALIGN_CENTER_VERTICAL | wx.ALL, 0)
             self.inputsSizer.Add(fieldSizer, 0, wx.EXPAND | wx.BOTTOM, 5)
             # Store info about added input box