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diff --git a/doc/scdaemon.texi b/doc/scdaemon.texi
index 5a5a1af6a..51ec4b34c 100644
--- a/doc/scdaemon.texi
+++ b/doc/scdaemon.texi
@@ -88,11 +88,34 @@ Outputs additional information while running.
You can increase the verbosity by giving several
verbose commands to @sc{gpgsm}, such as @samp{-vv}.
+@item --debug-level @var{level}
+@opindex debug-level
+Select the debug level for investigating problems. @var{level} may be
+one of:
+
+ @table @code
+ @item none
+ no debugging at all.
+ @item basic
+ some basic debug messages
+ @item advanced
+ more verbose debug messages
+ @item expert
+ even more detailed messages
+ @item guru
+ all of the debug messages you can get
+ @end table
+
+How these messages are mapped to the actual debugging flags is not
+specified and may change with newer releaes of this program. They are
+however carefully selected to best aid in debugging.
+
@item --debug @var{flags}
@opindex debug
This option is only useful for debugging and the behaviour may change at
any time without notice. FLAGS are bit encoded and may be given in
usual C-Syntax. The currently defined bits are:
+
@table @code
@item 0 (1)
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