diff --git a/xB.adoc b/xB.adoc
index ec5ecb6..1cf14ab 100644
--- a/xB.adoc
+++ b/xB.adoc
@@ -60,7 +60,7 @@ using the IRC protocol.  (Caveat: the standard C library doesn't automatically
 flush FILE streams for pipes on newlines.)  A special *XB* command is introduced
 for RPC, with the following subcommands:
 
-*XB get_config* _key_::
+*XB get_config* __key__::
 	Request the value of the given configuration option.  If no such option
 	exists, the value will be empty.  The response will be delivered in
 	the following format: