diff --git a/docs/Troubleshooting.md b/docs/Troubleshooting.md
index e39cc49..ccb43ca 100644
--- a/docs/Troubleshooting.md
+++ b/docs/Troubleshooting.md
@@ -17,6 +17,7 @@
 - **_Slower blink(on=1s,off=1s)_**: PPM has been selected but no valid signal is being seen on the PPM pin.
 - **_Fast double blink(on=0.1s,off=0.1s,on=0.1s,off=0.5s)_**: serial debugging is enabled and is waiting for a serial connection
 - **_On_**: Module is in normal operation mode (transmitting control signals).
+- **_SOS_**: Module's CPU does not match the minimum requirement of 128KB. The module won't boot further. This has been introduced after finding out that some module's manufacturers are using wrong components which are causing unexpected behaviors with bad consequences...
 
 ## Protocol selection