diff --git a/gpgmymail b/gpgmymail
index 48fbafd..0e2233f 100755
--- a/gpgmymail
+++ b/gpgmymail
@@ -97,7 +97,8 @@ def decrypt(message: email.message.Message) -> str:
 def main() -> None:
     """Program entry"""
     parser = argparse.ArgumentParser(
-        description="Encrypt/decrypt mail using GPG/MIME"
+        description="Encrypt/decrypt mail using GPG/MIME. Takes an email from "
+                    "stdin and outputs to stdout."
     )
     parser.add_argument('-d', '--decrypt', action="store_true",
                         help="Decrypt rather than encrypt")