diff --git a/plugins/modules/openssh_keypair.py b/plugins/modules/openssh_keypair.py
index 7f4bd678..33e4c6f8 100644
--- a/plugins/modules/openssh_keypair.py
+++ b/plugins/modules/openssh_keypair.py
@@ -21,6 +21,7 @@ requirements:
   - ssh-keygen (if O(backend=openssh))
   - cryptography >= 2.6 (if O(backend=cryptography) and OpenSSH < 7.8 is installed)
   - cryptography >= 3.0 (if O(backend=cryptography) and OpenSSH >= 7.8 is installed)
+  - bcrypt (if O(backend=cryptography) and O(passphrase) is used)
 extends_documentation_fragment:
   - ansible.builtin.files
   - community.crypto.attributes
@@ -78,6 +79,7 @@ options:
       - Passphrase used to decrypt an existing private key or encrypt a newly generated private key.
       - Passphrases are not supported for O(type=rsa1).
       - Can only be used when O(backend=cryptography), or when O(backend=auto) and a required C(cryptography) version is installed.
+        Note that depending on the cryptography version, the C(bcrypt) package is also needed.
     type: str
     version_added: 1.7.0
   private_key_format: