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-rw-r--r--doc/doc-docbook/spec.xfpt3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index d7d981ea7..a8b7af4f9 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -3552,6 +3552,9 @@ example:
exim '-D ABC = something' ...
.endd
&%-D%& may be repeated up to 10 times on a command line.
+.new
+Only macro names up to 22 letters long can be set.
+.wen
.vitem &%-d%&<&'debug&~options'&>