diff --git a/doc/asciidoc.conf b/doc/asciidoc.conf
index 8bfa317cd..29105d575 100644
--- a/doc/asciidoc.conf
+++ b/doc/asciidoc.conf
@@ -3,6 +3,7 @@
 @k\(A-\)=<span class="key alt">Alt</span><span class="keyplus">+</span>
 @k\(S-\)=<span class="key shift">Shift</span><span class="keyplus">+</span>
 @k\(l\)=<span class="key">l</span><span class="keyplus"> (L)</span>
+@k\(([A-Za-z0-9_&\=])\)=<span class="key">\1</span>
 @k\(([a-z0-9_&\=][^)]*)\)=<span class="key">\1</span>
 @k\(([^)]+)\)=<span class="key other">\1</span>