diff --git a/web/index.html b/web/index.html
index 55889f1..c5846e9 100644
--- a/web/index.html
+++ b/web/index.html
@@ -154,7 +154,11 @@ process at its next frame boundary, in about twenty milliseconds.</p>
 
 <p>This page describes the compiler <em>as it is</em>, not as it is planned. Where
 something is designed but not built, it says so and gives the message the compiler
-prints. Every Flan program below was run.</p>
+prints for it. Every Flan program on this page is a file in <code>web/examples/</code>
+with its output recorded beside it; <code>sh web/examples/check.sh</code> runs them all
+and compares, and <code>quotes.sh</code> re-derives the blocks that are transcripts
+rather than programs. If the page and the compiler disagree, one of those two goes
+red.</p>
 
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   <ul>