diff --git a/Doc/tools/templates/download.html b/Doc/tools/templates/download.html
index 1a99b18bbb268e..0133a5fa170801 100644
--- a/Doc/tools/templates/download.html
+++ b/Doc/tools/templates/download.html
@@ -13,7 +13,7 @@ <h1>Download Python {{ release }} Documentation</h1>
 
 <p>To download an archive containing all the documents for this version of
 Python in one of various formats, follow one of links in this table. The numbers
-in the table are the size of the download files in megabytes.</p>
+in the table are the size of the download files in mebibytes (2<sup>20</sup> bytes).</p>
 
 <table class="docutils">
   <tr><th>Format</th><th>Packed as .zip</th><th>Packed as .tar.bz2</th></tr>