diff --git a/Usage-cautions.md b/Usage-cautions.md
index c3aaf4d..6c7ea15 100644
--- a/Usage-cautions.md
+++ b/Usage-cautions.md
@@ -10,4 +10,4 @@ The LNA of HackRF is extremely sensitive, thus you need to notice the following
 
 # I suspect I damaged the LNA, how do i check?
 - Try listen local radio. Try with AMP on and off both. 
-- Try capture and replay a **non**-rolling-code <sub>(to prevent break the rolling sync)</sub> fob(radio remote <sub>not IR remote which is more common</sub>). Try with AMP on and off both. 
\ No newline at end of file
+- Try capture and replay a **non**-rolling-code <sub>(to prevent break the rolling sync)</sub> fob (radio remote <sub>not IR remote which is more common</sub>). Try with AMP on and off both. 
\ No newline at end of file