diff --git a/README.md b/README.md
index 4aa8025..bd7e1f3 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ The schematic is very simple:
 ###...and on a Mini Pro.
 <img src="https://raw.githubusercontent.com/rossumur/Zorkduino/master/docs/ProMini.jpg" width="100%"/>
 
-Just about any SD card or microsd card breakout will do. Some of the very cheap ones (<$1) don't have 5v to 3v3 level converters and may fry your SD card so caveat emptor. As always, Adafruit has nice ones.
+Just about any SD card or microsd card breakout will do. Some of the very cheap ones (<$1) don't have 5v to 3.3v level converters and may fry your SD card so caveat emptor. As always, Adafruit has nice ones.
 
 WebTV keyboards come in various guises: WebTV, MsnTV, Displayer, UltimateTV etc. They all should work just fine. A few places have the nice Philips variant new for $11.95 w/ free shipping (search for 'SWK-8630'). This one comes with a nice PS2 IR receiver; more on it later.