diff --git a/bookindex.md b/bookindex.md
index 57ea5f39b..4a7ab0957 100644
--- a/bookindex.md
+++ b/bookindex.md
@@ -238,7 +238,7 @@
  - HTTP redirects: [Short options](cmdline/options.md#short-options), [Available exit codes](cmdline/exitcode.md#available-exit-codes), [Tell curl to follow redirects](http/redirects.md#tell-curl-to-follow-redirects), [Submit a login form over HTTP](examples/login.md#submit-a-login-form-over-http)
  - HTTP Strict Transport Security: [HSTS](http/hsts.md#hsts), [HSTS](transfers/callbacks/hsts.md#hsts), [HSTS](internals/caches.md#hsts)
  - HTTP/1.1: [HTTP](protocols/curl.md#http), [HTTP basics](protocols/http.md#http-basics), [Trace options](usingcurl/verbose/trace.md#trace-options), [HTTP/2](usingcurl/proxies/https.md#http-slash-2), [Debugging with TELNET](usingcurl/telnet.md#debugging-with-telnet), [HTTP/2](http/versions/http2.md#http-slash-2), [Caveats](http/post/chunked.md#caveats), [The HTTP this generates](http/post/multipart.md#the-http-this-generates), [GET or POST?](http/redirects.md#get-or-post), [Request method](http/modify/method.md#request-method), [Request target](http/modify/target.md#request-target), [Customize HTTP request headers](libcurl-http/requests.md#customize-http-request-headers), [Versions](libcurl-http/versions.md#versions), [About content encodings](internals/content-encoding.md#about-content-encodings)
- - HTTP/2: [HTTP](protocols/curl.md#http), [docs](source/layout.md#docs), [nghttp2](build/deps.md#nghttp2), [Line 4: Features](cmdline/curlver.md#line-4-features), [Available exit codes](cmdline/exitcode.md#available-exit-codes), [More data](usingcurl/verbose/trace.md#more-data), [HTTP headers](usingcurl/downloads/compression.md#http-headers), [HTTP/2](usingcurl/proxies/https.md#http-slash-2), [HTTP/2](http/versions/http2.md#http-slash-2), [HTTP/3](http/versions/http3.md#http-slash-3), [HTTP/2 and later](http/post/expect100.md#http-slash-2-and-later), [GET or POST?](http/redirects.md#get-or-post), [HTTP/3](http/altsvc.md#http-slash-3), [Trace more](libcurl/verbose.md#trace-more), [When connections are not reused as you want](transfers/conn/reuse.md#when-connections-are-not-reused-as-you-want), [DNS over HTTPS](transfers/conn/names.md#dns-over-https), [Versions](libcurl-http/versions.md#versions), [Expect: headers](libcurl-http/upload.md#expect-headers), [Multiplexing](libcurl-http/multiplexing.md#multiplexing), [HTTP/3](libcurl-http/alt-svc.md#http-slash-3), [Different backends](internals/backends.md#different-backends), [Curl_easy](internals/structs.md#curl_easy), [Variables](internals/tests/file-format.md#variables)
+ - HTTP/2: [HTTP](protocols/curl.md#http), [docs](source/layout.md#docs), [nghttp2](build/deps.md#nghttp2), [Line 4: Features](cmdline/curlver.md#line-4-features), [Available exit codes](cmdline/exitcode.md#available-exit-codes), [More data](usingcurl/verbose/trace.md#more-data), [HTTP headers](usingcurl/downloads/compression.md#http-headers), [HTTP/2](usingcurl/proxies/https.md#http-slash-2), [HTTP/2](http/versions/http2.md#http-slash-2), [HTTP/3](http/versions/http3.md#http-slash-3), [HTTP/2 and later](http/post/expect100.md#http-slash-2-and-later), [GET or POST?](http/redirects.md#get-or-post), [HTTP/3](http/altsvc.md#http-slash-3), [Trace more](libcurl/verbose.md#trace-more), [When connections are not reused as you want](transfers/conn/reuse.md#when-connections-are-not-reused-as-you-want), [DNS over HTTPS](transfers/conn/names.md#dns-over-https), [HTTPS proxy](transfers/conn/proxies.md#https-proxy), [Versions](libcurl-http/versions.md#versions), [Expect: headers](libcurl-http/upload.md#expect-headers), [Multiplexing](libcurl-http/multiplexing.md#multiplexing), [HTTP/3](libcurl-http/alt-svc.md#http-slash-3), [Different backends](internals/backends.md#different-backends), [Curl_easy](internals/structs.md#curl_easy), [Variables](internals/tests/file-format.md#variables)
  - HTTP/3: [HTTP](protocols/curl.md#http), [Select HTTP/3 backend](build/autotools.md#select-http-slash-3-backend), [QUIC and HTTP/3](build/deps.md#quic-and-http-slash-3), [TCP vs UDP](cmdline/urls/port.md#tcp-vs-udp), [Line 4: Features](cmdline/curlver.md#line-4-features), [Available exit codes](cmdline/exitcode.md#available-exit-codes), [More data](usingcurl/verbose/trace.md#more-data), [HTTP headers](usingcurl/downloads/compression.md#http-headers), [HTTP/3](http/versions/http3.md#http-slash-3), [HTTP/3](http/altsvc.md#http-slash-3), [Which libcurl version runs](libcurl/api.md#which-libcurl-version-runs), [Trace more](libcurl/verbose.md#trace-more), [HTTP/3](transfers/conn/how.md#http-slash-3), [When connections are not reused as you want](transfers/conn/reuse.md#when-connections-are-not-reused-as-you-want), [Versions](libcurl-http/versions.md#versions), [Expect: headers](libcurl-http/upload.md#expect-headers), [Multiplexing](libcurl-http/multiplexing.md#multiplexing), [HTTP/3](libcurl-http/alt-svc.md#http-slash-3), [Different backends](internals/backends.md#different-backends)
  - HTTP/3 backend: [Select HTTP/3 backend](build/autotools.md#select-http-slash-3-backend)
  - --http0.9: [HTTP/0.9](http/versions/http09.md#http-slash-0-dot-9)