diff --git a/how_to b/how_to
index 9701075..34f0ad0 100644
--- a/how_to
+++ b/how_to
@@ -1152,6 +1152,9 @@ Manual IMAP connection:
     A2 list "" "*"
     # list everything under a particular prefix
     A3 list "INBOX" "*"
+    # Or:
+    # (will print current UIDVALIDITY (useful for fixing mbsync))
+    A4 select inbox
     A99 logout
 
 gdb tricks: