diff --git a/Usage-cautions.md b/Usage-cautions.md
index 9a2c04d..ecee709 100644
--- a/Usage-cautions.md
+++ b/Usage-cautions.md
@@ -10,7 +10,9 @@ The LNA of HackRF is sensitive and can get damaged
 
 # Diagnostic
 - 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. 
+- Try capture and replay a non-rolling-code. Try with AMP on and off both. 
+
+Check more details about [tx](https://github.com/portapack-mayhem/mayhem-firmware/wiki/preamplifier-ic-replacement#tx-problems) and [rx](https://github.com/portapack-mayhem/mayhem-firmware/wiki/preamplifier-ic-replacement#rx-problems) issues.
 
 # Repair
 [How to replace the broken component](https://github.com/portapack-mayhem/mayhem-firmware/wiki/preamplifier-ic-replacement)
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