diff --git a/templates/index.mako b/templates/index.mako
index 63c5b20..c95bc3c 100644
--- a/templates/index.mako
+++ b/templates/index.mako
@@ -18,7 +18,7 @@
             % elif query.error == "bad URI":
                 Unsupported URI scheme: <a href="${query.url | h}">${query.url | h}</a>.
             % elif query.error == "no data":
-                Couldn't find any text in <a href="${query.url | h}">${query.url | h}</a>. <i>Note:</i> only HTML and plain text pages are supported, and content generated by JavaScript or found inside iframes is ignored.
+                Couldn't find any text in <a href="${query.url | h}">${query.url | h}</a>. <i>Note:</i> only HTML documents, plain text pages, and PDFs are supported, and content generated by JavaScript or found inside iframes is ignored.
             % elif query.error == "timeout":
                 The URL <a href="${query.url | h}">${query.url | h}</a> timed out before any data could be retrieved.
             % elif query.error == "search error":