diff --git a/appendices/comparisons.xml b/appendices/comparisons.xml
index d2b8f1c03e..4d2f38781a 100644
--- a/appendices/comparisons.xml
+++ b/appendices/comparisons.xml
@@ -69,7 +69,7 @@
       <entry>&false;</entry>
      </row>
      <row>
-      <entry><literal>$x = null</literal></entry>
+      <entry><literal>$x = null;</literal></entry>
       <entry><type>NULL</type></entry>
       <entry>&true;</entry>
       <entry>&true;</entry>