diff --git a/asciigraph.go b/asciigraph.go
index 394b66d..1cf6a16 100644
--- a/asciigraph.go
+++ b/asciigraph.go
@@ -48,6 +48,12 @@ func PlotMany(data [][]float64, options ...Option) string {
 			maximum = max
 		}
 	}
+	if config.LowerBound != nil && *config.LowerBound < minimum {
+		minimum = *config.LowerBound
+	}
+	if config.UpperBound != nil && *config.UpperBound > maximum {
+		maximum = *config.UpperBound
+	}
 	interval := math.Abs(maximum - minimum)
 
 	if config.Height <= 0 {
diff --git a/asciigraph_test.go b/asciigraph_test.go
index 464bf2b..f8d69dc 100644
--- a/asciigraph_test.go
+++ b/asciigraph_test.go
@@ -201,6 +201,44 @@ func TestPlot(t *testing.T) {
  38.46 ┤                                                     ││ │││
  37.46 ┤                                                     ╰╯ │││
  36.45 ┤                                                        ╰╯╰`},
+		{
+			[]float64{2, 1, 1, 2, -2, 5, 7, 11, 3, 7, 4, 5, 6, 9, 4, 0, 6, 1, 5, 3, 6, 2},
+			[]Option{LowerBound(-3), UpperBound(13)},
+			` 13.00 ┤
+ 12.00 ┤
+ 11.00 ┤      ╭╮
+ 10.00 ┤      ││
+  9.00 ┤      ││    ╭╮
+  8.00 ┤      ││    ││
+  7.00 ┤     ╭╯│╭╮  ││
+  6.00 ┤     │ │││ ╭╯│ ╭╮  ╭╮
+  5.00 ┤    ╭╯ │││╭╯ │ ││╭╮││
+  4.00 ┤    │  ││╰╯  ╰╮││││││
+  3.00 ┤    │  ╰╯     ││││╰╯│
+  2.00 ┼╮ ╭╮│         ││││  ╰
+  1.00 ┤╰─╯││         ││╰╯
+  0.00 ┤   ││         ╰╯
+ -1.00 ┤   ││
+ -2.00 ┤   ╰╯
+ -3.00 ┤`},
+		{
+			[]float64{2, 1, 1, 2, -2, 5, 7, 11, 3, 7, 4, 5, 6, 9, 4, 0, 6, 1, 5, 3, 6, 2},
+			[]Option{LowerBound(0), UpperBound(3)},
+			` 11.00 ┤      ╭╮
+ 10.00 ┤      ││
+  9.00 ┤      ││    ╭╮
+  8.00 ┤      ││    ││
+  7.00 ┤     ╭╯│╭╮  ││
+  6.00 ┤     │ │││ ╭╯│ ╭╮  ╭╮
+  5.00 ┤    ╭╯ │││╭╯ │ ││╭╮││
+  4.00 ┤    │  ││╰╯  ╰╮││││││
+  3.00 ┤    │  ╰╯     ││││╰╯│
+  2.00 ┼╮ ╭╮│         ││││  ╰
+  1.00 ┤╰─╯││         ││╰╯
+  0.00 ┤   ││         ╰╯
+ -1.00 ┤   ││
+ -2.00 ┤   ╰╯`},
+
 		{
 			[]float64{1, 1, math.NaN(), 1, 1},
 			nil,
diff --git a/options.go b/options.go
index 0a2b160..c11156f 100644
--- a/options.go
+++ b/options.go
@@ -11,14 +11,15 @@ type Option interface {
 
 // config holds various graph options
 type config struct {
-	Width, Height int
-	Offset        int
-	Caption       string
-	Precision     uint
-	CaptionColor  AnsiColor
-	AxisColor     AnsiColor
-	LabelColor    AnsiColor
-	SeriesColors  []AnsiColor
+	Width, Height          int
+	LowerBound, UpperBound *float64
+	Offset                 int
+	Caption                string
+	Precision              uint
+	CaptionColor           AnsiColor
+	AxisColor              AnsiColor
+	LabelColor             AnsiColor
+	SeriesColors           []AnsiColor
 }
 
 // An optionFunc applies an option.
@@ -59,6 +60,18 @@ func Height(h int) Option {
 	})
 }
 
+// LowerBound sets the graph's minimum value for the vertical axis. It will be ignored
+// if the series contains a lower value.
+func LowerBound(min float64) Option {
+	return optionFunc(func(c *config) { c.LowerBound = &min })
+}
+
+// UpperBound sets the graph's maximum value for the vertical axis. It will be ignored
+// if the series contains a bigger value.
+func UpperBound(max float64) Option {
+	return optionFunc(func(c *config) { c.UpperBound = &max })
+}
+
 // Offset sets the graphs offset.
 func Offset(o int) Option {
 	return optionFunc(func(c *config) { c.Offset = o })