diff --git a/cheatsheets/ssh-keygen b/cheatsheets/ssh-keygen
index 5d9266d..f70a3ea 100644
--- a/cheatsheets/ssh-keygen
+++ b/cheatsheets/ssh-keygen
@@ -4,6 +4,15 @@ ssh-keygen -t rsa
 # To generate a 4096-bit SSH key:
 ssh-keygen -t rsa -b 4096
 
+# To update a passphrase on a key
+ssh-keygen -p -P old_passphrase -N new_passphrase -f /path/to/keyfile
+
+# To remove a passphrase on a key
+ssh-keygen -p -P old_passphrase -N '' -f /path/to/keyfile
+
+# To generate a 4048 bit RSA key with a passphase and comment containing the user and hostname
+ssh-keygen -t rsa -b 4048 -C "$USER@$HOSTNAME" -P passphrase
+
 # To copy a key to a remote host:
 ssh-copy-id username@host