diff --git a/FAQ.md b/FAQ.md
index 5ee618c2bd..6a4e5ef73a 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -712,6 +712,7 @@ Common errors:
 
 * *No certificate found matching targetContraints*: this likely means you are using an old version of FairEmail
 * *unable to find valid certification path to requested target*: basically this means one or more intermediate or root certificates were not found
+* *Private key does not match any encryption keys*: the selected key cannot be used to decrypt the message, probably because it is the incorrect key
 
 In case the certificate chain is incorrect, you can tap on the little info button to show the all certificates.
 After the certificate details the issuer or "selfSign" is shown.