diff --git a/AWS-IoT.md b/AWS-IoT.md
index 8e3049c3..e29f5235 100644
--- a/AWS-IoT.md
+++ b/AWS-IoT.md
@@ -177,6 +177,21 @@ The second part is the Certificate delivered by AWS IoT. Tasmota will also need
 
 Both credentials must be stored in Tasmota Flash memory, in that order, using the new `TLSKey` command.
 
+#### a. First check that the key store is empty
+
+Type the following command:
+
+```
+TLSKey
+xx:xx:xx MQT: stat/sonoff/RESULT = {"TLSKey1":-1,"TLSKey2":-1}
+```
+
+If both values are `-1`, it means it does not contain any key.
+
+If you need to reset the key store, use the command `TLSKey 0`.
+
+#### b. Convert the Private Key
+
 ### Step 9. Configure Tasmota device
 
 This is the last step, you need to configure the MQTT parameters. The easiest way is through the web console.