diff --git a/header.html b/header.html
index 0ebe9d9..b42ad0e 100644
--- a/header.html
+++ b/header.html
@@ -37,6 +37,8 @@ sudo apt update</code></pre>
 	
 	<p>While packages in this repository primarily come from continuous integration / deployment, package updates are normally stashed and released every day at 2am, to ease updates for clients.</p>
 	
-	<p>A human-readable summary of the packages available in this repository can be found in <a href="/SUMMARY.txt"><code>SUMMARY.txt</code></a>.</p>
+	<p>A human-readable summary of the packages available in this repository can be found in <a href="/SUMMARY.txt"><code>SUMMARY.txt</code></a>, which is automatically generated from the source packages in the repo.</p>
+	
+	<p>Note that while older versions of packages <em>do</em> exist in this repository, they are not guaranteed to stick around - as they may be cleared out periodically (todo: automatically clear out packages older than ~2-3 versions behind) to save on disk space.</p>
 	
 	<h1>Index of