2 files changed, 20 insertions, 1 deletions
diff --git a/docs/cmdline-opts/Makefile.inc b/docs/cmdline-opts/Makefile.inc
index 9891f3717..778149ca3 100644
--- a/docs/cmdline-opts/Makefile.inc
+++ b/docs/cmdline-opts/Makefile.inc
@@ -12,7 +12,9 @@ DPAGES = abstract-unix-socket.d anyauth.d append.d basic.d cacert.d capath.d cer
   form.d form-string.d ftp-account.d ftp-alternative-to-user.d          \
   ftp-create-dirs.d ftp-method.d ftp-pasv.d ftp-port.d ftp-pret.d       \
   ftp-skip-pasv-ip.d ftp-ssl-ccc.d ftp-ssl-ccc-mode.d ftp-ssl-control.d \
-  get.d globoff.d head.d header.d help.d hostpubmd5.d http1.0.d         \
+  get.d globoff.d                                                       \
+  happy-eyeballs-timeout-ms.d                                           \
+  head.d header.d help.d hostpubmd5.d http1.0.d                         \
   http1.1.d http2.d http2-prior-knowledge.d ignore-content-length.d     \
   include.d insecure.d interface.d ipv4.d ipv6.d junk-session-cookies.d \
   keepalive-time.d key.d key-type.d krb.d libcurl.d limit-rate.d        \
diff --git a/docs/cmdline-opts/happy-eyeballs-timeout-ms.d b/docs/cmdline-opts/happy-eyeballs-timeout-ms.d
new file mode 100644
index 000000000..ec9a8c228
--- /dev/null
+++ b/docs/cmdline-opts/happy-eyeballs-timeout-ms.d
@@ -0,0 +1,17 @@
+Long: happy-eyeballs-timeout-ms
+Arg: <milliseconds>
+Help: How long to wait in milliseconds for IPv6 before trying IPv4
+Added: 7.59.0
+---
+Happy eyeballs is an algorithm that attempts to connect to both IPv4 and IPv6
+addresses for dual-stack hosts, preferring IPv6 first for the number of
+milliseconds. If the IPv6 address cannot be connected to within that time then
+a connection attempt is made to the IPv4 address in parallel. The first
+connection to be established is the one that is used.
+
+The range of suggested useful values is limited. Happy Eyeballs RFC 6555 says
+"It is RECOMMENDED that connection attempts be paced 150-250 ms apart to
+balance human factors against network load." libcurl currently defaults to
+200 ms. Firefox and Chrome currently default to 300 ms.
+
+If this option is used several times, the last one will be used.