diff --git a/doc/arm/Bv9ARM.ch06.html b/doc/arm/Bv9ARM.ch06.html
index d25d2fce33..1115fe2ecd 100644
--- a/doc/arm/Bv9ARM.ch06.html
+++ b/doc/arm/Bv9ARM.ch06.html
@@ -1137,7 +1137,7 @@
    [ <span><strong class="command">channel</strong></span> <em class="replaceable"><code>channel_name</code></em> {
      ( <span><strong class="command">file</strong></span> <em class="replaceable"><code>path_name</code></em>
          [ <span><strong class="command">versions</strong></span> ( <em class="replaceable"><code>number</code></em> | <span><strong class="command">unlimited</strong></span> ) ]
-         [ <span><strong class="command">size</strong></span> <em class="replaceable"><code>size spec</code></em> ]
+         [ <span><strong class="command">size</strong></span> <em class="replaceable"><code>size_spec</code></em> ]
        | <span><strong class="command">syslog</strong></span> <em class="replaceable"><code>syslog_facility</code></em>
        | <span><strong class="command">stderr</strong></span>
        | <span><strong class="command">null</strong></span> );