diff --git a/index.html b/index.html
index 39f03f2..1aebce1 100644
--- a/index.html
+++ b/index.html
@@ -274,6 +274,14 @@ <h3>Document Title</h3>
 convention.</p>
 
 <p>Capitalize title words following U.S. usage.</p>
+
+<p><code>Part_Number</code>, edition number, and <code>Version_Number</code>
+  SHOULD take the form X.Y.Z where X, Y, and Z are non-negative integers, and MUST NOT contain leading
+  zeroes. X is the major version, Y is the minor version, and Z is the patch version. X, Y and Z are separated
+  by '.' (DOT). Y and Z are optional (2, 2.0, 2.0.0 are equivalent).
+  Each element SHOULD increase numerically. Major version one (1.y.z) is for initial development. For additional
+  considerations, one may see also <a href="https://semver.org/">Semantic Versioning</a> if applicable.
+</p>
 </section>
 
 <section id="Editors">