diff --git a/README.md b/README.md
index 99184bc..1a7fdc9 100644
--- a/README.md
+++ b/README.md
@@ -1811,7 +1811,7 @@ Enter passphrase for /dev/mmcblk0p1:
 $ sudo mount /dev/mapper/secret /mnt/encrypted-storage
 ```
 
-Import the master key and configuration to a temporary working directory:
+Import the master key and configuration to a temporary working directory. Note that Windows users should import mastersub.gpg:
 
 ```console
 $ export GNUPGHOME=$(mktemp -d -t gnupg_$(date +%Y%m%d%H%M)_XXX)
@@ -2741,7 +2741,7 @@ Before you unmount your backup, ask yourself if you should make another one just
     ```
     you need to adjust the trust associated with the key. See the above bullet.
 
-- If you receive the error, `gpg: 0x0000000000000000: skipped: Unusable public key` or `encryption failed: Unusable public key` the sub-key may be expired and can no longer be used to encrypt nor sign messages. It can still be used to decrypt and authenticate, however.
+- If you receive the error, `gpg: 0x0000000000000000: skipped: Unusable public key`, `signing failed: Unusable secret key`, or `encryption failed: Unusable public key` the sub-key may be expired and can no longer be used to encrypt nor sign messages. It can still be used to decrypt and authenticate, however.
 
 - Refer to Yubico article [Troubleshooting Issues with GPG](https://support.yubico.com/hc/en-us/articles/360013714479-Troubleshooting-Issues-with-GPG) for additional guidance.