diff --git a/language/control-structures/include.xml b/language/control-structures/include.xml
index 276a94cb67..4acc0f4244 100644
--- a/language/control-structures/include.xml
+++ b/language/control-structures/include.xml
@@ -23,6 +23,12 @@
   <function>require</function>, which will emit an
   <constant>E_ERROR</constant>.
  </simpara>
+ <simpara>
+  Note that both <literal>include</literal> and <literal>require</literal>
+  raise additional <constant>E_WARNING</constant>s, if the file cannot be
+  accessed, before raising the final <constant>E_WARNING</constant> or
+  <constant>E_ERROR</constant>, respectively.
+ </simpara>
  <simpara>
   If a path is defined — whether absolute (starting with a drive letter
   or <literal>\</literal> on Windows, or <literal>/</literal> on Unix/Linux