add note about --armor

1 files changed, 5 insertions, 0 deletions

diff --git a/sq-guide.md b/sq-guide.md
index 340c306..154f303 100644
--- a/sq-guide.md
+++ b/sq-guide.md
@@ -776,6 +776,11 @@ or using a hexadecimal key identifier or key finger print. The set of
 keys and certificates in that directory is called a _keyring_. possibly
 be a comparison table, for easy review.
 
+GnuPG typically outputs binary files. The `--armor` option tells it to
+write a textual representation. That representation is still not
+human-readable, but can be easier to transmit over various channels
+that expect text instead of binary data.
+
 ## Generate a key and certificate
 
 ```