diff --git a/FAQ.md b/FAQ.md
index 91bc9f5..167f5ba 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -1437,6 +1437,10 @@ Case 4:
 
 > I already host another new console with fresh, thanks. The issue is my docker-compose.yml not configure properly, so the db.sqlite3, d_ed25519 and id_ed25519.pub (keys) was not keep in /data, it keep somewhere like temporary folder, every time restart docker, the db.sqlite3 was regenerated.
 
+Case 5:
+
+> The entered key is incorrect because the trailing `=` character is missing.
+
 # RustDesk Service service terminated unexpectedly
 
 https://github.com/rustdesk/rustdesk/discussions/11006