doc: document DragonFly BSD port
LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/80120044
diff --git a/doc/install-source.html b/doc/install-source.html
index e7ebf10..c1ef4e7 100644
--- a/doc/install-source.html
+++ b/doc/install-source.html
@@ -69,8 +69,8 @@
</p>
<p>
-The compilers can target the FreeBSD, Linux, NetBSD, OpenBSD, OS X (Darwin), Plan 9,
-Solaris and Windows operating systems.
+The compilers can target the DragonFly BSD, FreeBSD, Linux, NetBSD, OpenBSD,
+OS X (Darwin), Plan 9, Solaris and Windows operating systems.
The full set of supported combinations is listed in the discussion of
<a href="#environment">environment variables</a> below.
</p>
@@ -358,7 +358,7 @@
<p>
Choices for <code>$GOOS</code> are
-<code>darwin</code> (Mac OS X 10.6 and above), <code>freebsd</code>,
+<code>darwin</code> (Mac OS X 10.6 and above), <code>dragonfly</code>, <code>freebsd</code>,
<code>linux</code>, <code>netbsd</code>, <code>openbsd</code>,
<code>plan9</code>, <code>solaris</code> and <code>windows</code>.
Choices for <code>$GOARCH</code> are
@@ -376,6 +376,12 @@
<td></td><td><code>darwin</code></td> <td><code>amd64</code></td>
</tr>
<tr>
+<td></td><td><code>dragonfly</code></td> <td><code>386</code></td>
+</tr>
+<tr>
+<td></td><td><code>dragonfly</code></td> <td><code>amd64</code></td>
+</tr>
+<tr>
<td></td><td><code>freebsd</code></td> <td><code>386</code></td>
</tr>
<tr>
