@vindex message-generate-hashcash
Variable that indicates whether @samp{X-Hashcash} headers
should be computed for the message. @xref{Hashcash, ,Hashcash,gnus,
-The Gnus Manual}. If @symbol{opportunistic}, only generate the
-headers when it doesn't lead to the user having to wait.
+The Gnus Manual}. If @code{opportunistic}, only generate the headers
+when it doesn't lead to the user having to wait.
@end table