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-rw-r--r--doc/doc-docbook/spec.xfpt2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index f8e73839a..0641ad124 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -10663,7 +10663,7 @@ number of lines in the message's body. See also &$message_linecount$&.
.cindex "binary zero" "in message body"
.vindex "&$body_zerocount$&"
When a message is being received or delivered, this variable contains the
-number of binary zero bytes in the message's body.
+number of binary zero bytes (ASCII NULs) in the message's body.
.vitem &$bounce_recipient$&
.vindex "&$bounce_recipient$&"