diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -868,6 +868,7 @@ Duck Types
 ### Comparable
 * **If eq() method is not overridden, it returns `'id(self) == id(other)'`, which is the same as `'self is other'`.**
 * **That means all objects compare not equal by default.**
+* **Only object on the left side of a comparison has eq() called, unless it returns 'NotImplemented', in which case the right object is consulted.**
 
 ```python
 class MyComparable:
diff --git a/index.html b/index.html
index 472f974..3de0206 100644
--- a/index.html
+++ b/index.html
@@ -775,6 +775,7 @@ creature  = Creature()
 <ul>
 <li><strong>If eq() method is not overridden, it returns <code class="python hljs"><span class="hljs-string">'id(self) == id(other)'</span></code>, which is the same as <code class="python hljs"><span class="hljs-string">'self is other'</span></code>.</strong></li>
 <li><strong>That means all objects compare not equal by default.</strong></li>
+<li><strong>Only object on the left side of a comparison has eq() called, unless it returns 'NotImplemented', in which case the right object is consulted.</strong></li>
 </ul>
 <pre><code class="python language-python hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MyComparable</span>:</span>
     <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, a)</span>:</span>
diff --git a/web/default.min.css b/web/default.min.css
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+++ b/web/default.min.css
@@ -1 +1 @@
-.hljs{overflow-x:auto}.hljs,.hljs-subst{}.hljs-comment{color:#888888}.hljs-keyword,.hljs-attribute,.hljs-selector-tag,.hljs-meta-keyword,.hljs-doctag,.hljs-name{font-weight:bold;color:#3182bd}.hljs-type,.hljs-string,.hljs-number,.hljs-selector-id,.hljs-selector-class,.hljs-quote,.hljs-template-tag,.hljs-deletion{color:#880000}.hljs-title,.hljs-section{color:#880000;font-weight:bold}.hljs-regexp,.hljs-symbol,.hljs-variable,.hljs-template-variable,.hljs-link,.hljs-selector-attr,.hljs-selector-pseudo{color:#BC6060}.hljs-literal{color:#78A960}.hljs-built_in,.hljs-bullet,.hljs-code,.hljs-addition{color:#397300}.hljs-meta{color:#1f7199}.hljs-meta-string{color:#4d99bf}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:bold}
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+.hljs{overflow-x:auto}.hljs,.hljs-subst{}.hljs-comment{color:#888888}.hljs-keyword,.hljs-attribute,.hljs-selector-tag,.hljs-meta-keyword,.hljs-doctag,.hljs-name{font-weight:bold;color:#3182bd}.hljs-type,.hljs-string,.hljs-number,.hljs-selector-id,.hljs-selector-class,.hljs-quote,.hljs-template-tag,.hljs-deletion{color:#880000}.hljs-title,.hljs-section{color:#880000;font-weight:bold}.hljs-regexp,.hljs-symbol,.hljs-variable,.hljs-template-variable,.hljs-link,.hljs-selector-attr,.hljs-selector-pseudo{color:#BC6060}.hljs-literal{color:#78A960}.hljs-meta{color:#1f7199}.hljs-meta-string{color:#4d99bf}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:bold}
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