diff --git a/man/signal-cli.1.adoc b/man/signal-cli.1.adoc
index 181eb9fc..d60ef3ad 100644
--- a/man/signal-cli.1.adoc
+++ b/man/signal-cli.1.adoc
@@ -231,7 +231,7 @@ Read the message from standard input.
 
 *-a* [ATTACHMENT [ATTACHMENT ...]], *--attachment* [ATTACHMENT [ATTACHMENT ...]]::
 Add one or more files as attachment.
-Data URI encoded attachments can be added and must follow the RFC 2397.
+Can be either a file path or a data URI. Data URI encoded attachments must follow the RFC 2397.
 Additionally a file name can be added:
 e.g.: `data:<MIME-TYPE>;filename=<FILENAME>;base64,<BASE64 ENCODED DATA>`