diff --git a/how-to-choose-a-binary-for-your-device.md b/how-to-choose-a-binary-for-your-device.md
index e0b2f28..0df2455 100644
--- a/how-to-choose-a-binary-for-your-device.md
+++ b/how-to-choose-a-binary-for-your-device.md
@@ -24,7 +24,7 @@ Download and import `lede-17.01.2-x86_virtual_machine_image_with_udp2raw_pre_ins
 Use the udp2raw inside virtual machine.
 
 ### Other Linux-based Device
-You have to build by yourself.Check:
+You have to build by yourself. Check:
 
 https://github.com/wangyu-/udp2raw-tunnel/blob/master/doc/build_guide.md