diff --git a/language/operators.xml b/language/operators.xml
index b6d626180f..b54f061e1c 100644
--- a/language/operators.xml
+++ b/language/operators.xml
@@ -213,7 +213,12 @@
    <para>
     For operators of equal precedence, left associativity means that
     evaluation proceeds from left to right, and right associativity means
-    the opposite.
+    the opposite. For operators of equal precedence that are non-associative
+    those operators may not associate with themselves. So for example, the
+    statement <literal>1 &lt; 2 &gt; 1</literal>, is illegal in PHP. Whereas,
+    the statement <literal>1 &lt;= 1 == 1</literal> is not, because the
+    <constant>T_IS_EQUAL</constant> operator has lesser precedence than the
+    <constant>T_IS_SMALLER_OR_EQUAL</constant> operator.
     <example>
      <title>Associativity</title>
      <programlisting role="php">