diff --git a/README.md b/README.md
index a5e167f..a6fd74e 100644
--- a/README.md
+++ b/README.md
@@ -359,7 +359,7 @@ import re
 <iter>  = re.finditer(r'<regex>', text)           # Returns all occurrences as Match objects.
 ```
 
-* **Raw string literals do not interpret escape sequences, thus enabling us to use regex-specific escape sequences that cause SyntaxWarning in normal string literals.**
+* **Raw string literals do not interpret escape sequences, thus enabling us to use regex-specific escape sequences that cause SyntaxWarning in normal string literals (since 3.12).**
 * **Argument 'new' of re.sub() can be a function that accepts a Match object and returns a str.**
 * **Argument `'flags=re.IGNORECASE'` can be used with all functions.**
 * **Argument `'flags=re.MULTILINE'` makes `'^'` and `'$'` match the start/end of each line.**
@@ -1026,9 +1026,9 @@ class C(A, B): pass
 ```python
 from collections import abc
 
-<name>: <type> [| ...] [= <obj>]
-<name>: list/set/abc.Iterable/abc.Sequence[<type>] [= <obj>]
-<name>: dict/tuple[<type>, ...] [= <obj>]
+<name>: <type> [| ...] [= <obj>]                              # `|` since 3.10.
+<name>: list/set/abc.Iterable/abc.Sequence[<type>] [= <obj>]  # Since 3.9.
+<name>: dict/tuple[<type>, ...] [= <obj>]                     # Since 3.9.
 ```
 
 ### Dataclass
diff --git a/index.html b/index.html
index 0541e71..26c9a21 100644
--- a/index.html
+++ b/index.html
@@ -335,7 +335,7 @@ Point(x=<span class="hljs-number">1</span>, y=<span class="hljs-number">2</span>
 
 
 <ul>
-<li><strong>Raw string literals do not interpret escape sequences, thus enabling us to use regex-specific escape sequences that cause SyntaxWarning in normal string literals.</strong></li>
+<li><strong>Raw string literals do not interpret escape sequences, thus enabling us to use regex-specific escape sequences that cause SyntaxWarning in normal string literals (since 3.12).</strong></li>
 <li><strong>Argument 'new' of re.sub() can be a function that accepts a Match object and returns a str.</strong></li>
 <li><strong>Argument <code class="python hljs"><span class="hljs-string">'flags=re.IGNORECASE'</span></code> can be used with all functions.</strong></li>
 <li><strong>Argument <code class="python hljs"><span class="hljs-string">'flags=re.MULTILINE'</span></code> makes <code class="python hljs"><span class="hljs-string">'^'</span></code> and <code class="python hljs"><span class="hljs-string">'$'</span></code> match the start/end of each line.</strong></li>
@@ -864,9 +864,9 @@ Z = dataclasses.make_dataclass(<span class="hljs-string">'Z'</span>, [<span clas
 <li><strong>Hints are used by type checkers like <a href="https://pypi.org/project/mypy/">mypy</a>, data validation libraries such as <a href="https://pypi.org/project/pydantic/">Pydantic</a> and lately also by <a href="https://pypi.org/project/Cython/">Cython</a> compiler. However, they are not enforced by CPython interpreter.</strong></li>
 </ul><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> collections <span class="hljs-keyword">import</span> abc
 
-&lt;name&gt;: &lt;type&gt; [| ...] [= &lt;obj&gt;]
-&lt;name&gt;: list/set/abc.Iterable/abc.Sequence[&lt;type&gt;] [= &lt;obj&gt;]
-&lt;name&gt;: dict/tuple[&lt;type&gt;, ...] [= &lt;obj&gt;]
+&lt;name&gt;: &lt;type&gt; [| ...] [= &lt;obj&gt;]                              <span class="hljs-comment"># `|` since 3.10.</span>
+&lt;name&gt;: list/set/abc.Iterable/abc.Sequence[&lt;type&gt;] [= &lt;obj&gt;]  <span class="hljs-comment"># Since 3.9.</span>
+&lt;name&gt;: dict/tuple[&lt;type&gt;, ...] [= &lt;obj&gt;]                     <span class="hljs-comment"># Since 3.9.</span>
 </code></pre></div>