diff --git a/appendices/ini.core.xml b/appendices/ini.core.xml
index 1c94e4a34e..a1a2391be5 100644
--- a/appendices/ini.core.xml
+++ b/appendices/ini.core.xml
@@ -416,7 +416,7 @@
         executed (development mode). When set to <literal>0</literal>,
         assertion code will be generated but it will be skipped (not executed)
         at runtime. When set to <literal>-1</literal>, assertion code will not
-        be generated, making the assetions zero-cost (production mode).
+        be generated, making the assertions zero-cost (production mode).
        </simpara>
       </listitem>
      </varlistentry>