diff --git a/easelib.lua b/easelib.lua
index 35aee15..f7b8b61 100644
--- a/easelib.lua
+++ b/easelib.lua
@@ -172,4 +172,27 @@ table.insert(self, {'inOutBack', function(t, a)
   or  0.5 + 0.5 * self.outBack(t * 2 - 1, a)
 end, {0, 3, 1.70158, 'a'}, overridemin = true, type = 'inout'})
 
+-- custom stuff
+
+local function exposin(x, e)
+  if ((x - 1) % 4) < 2 then
+    return math.pow(math.abs(x % 4 - 2), e) - 1
+  else
+    return -math.pow(math.abs((x + 2) % 4 - 2), e) + 1
+  end
+end
+local function expocos(x, e)
+  return exposin(x + 1, e)
+end
+
+table.insert(self, {'inExponent*', function(x, e)
+  return 1 - -expocos(1 - x, e)
+end, {0, 10, 2, 'e'}, type = 'in'})
+table.insert(self, {'outExponent*', function(x, e)
+  return -expocos(x, e)
+end, {0, 10, 2, 'e'}, type = 'out'})
+table.insert(self, {'inOutExponent*', function(x, e)
+  return 0.5 - 0.5 * exposin(x * 2, e)
+end, {0, 10, 2, 'e'}, type = 'inout'})
+
 return self
diff --git a/screenshot1.png b/screenshot1.png
index 5a3faac..51d49f1 100644
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diff --git a/screenshot2.png b/screenshot2.png
index 0d49b4f..b0dc23e 100644
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