1 files changed, 4 insertions, 0 deletions
diff --git a/crypto.4 b/crypto.4
index 0dc21e9431f..c2d1102b538 100644
--- a/crypto.4
+++ b/crypto.4
@@ -571,6 +571,10 @@ member.
 The following input attributes are recognized:
 
 .RS
+.IP \fBNCR_ATTR_IV\fP
+Only used for some operations and algorithms.
+Optional,
+IV from session initialization or left from last update is used if not present.
 .IP \fBNCR_ATTR_UPDATE_INPUT_DATA\fP
 A
 .B struct ncr_session_input_data