diff --git a/Pyboard-Firmware-Update.md b/Pyboard-Firmware-Update.md
index fed458e..a68cc47 100644
--- a/Pyboard-Firmware-Update.md
+++ b/Pyboard-Firmware-Update.md
@@ -31,7 +31,7 @@ Found DFU: [0483:df11] devnum=0, cfg=1, intf=0, alt=3, name="@Device Feature/0xF
 ```
 
 If desired, backup the original firmware (this doesn't work with dfu-util 0.5, but does with 0.7 or newer).
-Previous releases of micropython are available from: http://micropython.org/download/ so performing a backup should be unecessary.
+Previous releases of micropython are available from: http://micropython.org/download/ so performing a backup shouldn't be unecessary.
 
 ```
 $ sudo dfu-util --alt 0 --upload pyboard-original.dfu -s:524288