diff --git a/terminalplotter.py b/terminalplotter.py
index 47f052d..20cb7da 100644
--- a/terminalplotter.py
+++ b/terminalplotter.py
@@ -1,5 +1,4 @@
 import asyncio
-import io
 import math
 import select
 import sys
@@ -53,6 +52,10 @@ class TerminalPlotter(pv.Plotter):
             self.camera.Elevation(10)
         elif c == "s":
             self.camera.Elevation(-10)
+        elif c == "+":
+            self.camera.zoom(1.1)
+        elif c == "-":
+            self.camera.zoom(0.9)
 
     async def _input_loop(self):
         fd = sys.stdin.fileno()