diff --git a/doc/virtual.md b/doc/virtual.md
index 52c12d5a..bda20426 100644
--- a/doc/virtual.md
+++ b/doc/virtual.md
@@ -1,5 +1,5 @@
 Virtual Environments
-=====================
+====================
 
 Infix primarily targets real hardware, deployment to the cloud is not a
 priority at the moment.  However, for development and testing purposes
@@ -14,28 +14,35 @@ QEMU
 
 > [!TIP]
 > Installation for Debian/Ubuntu based systems can be done by "simply":
-> <kbd>sudo apt install virt-manager</kbd> -- dependencies ensure the
-> relevant Qemu packages are pulled in as well.  This trick, installing
+> <kbd>sudo apt install virt-manager</kbd> -- dependencies ensure the relevant
+> Qemu packages are pulled in as well.  This trick, installing
 > [virt-manager][virt], helps set up Qemu networking on your system.
 
-A virtualized Infix x86_64 instance can be launched from a Linux system,
-with [Qemu][] installed, by issuing:
+A virtualized Infix x86_64 instance can be launched from a Linux system, with
+[Qemu][] installed, by issuing:
 
 ```
 $ ./qemu/run.sh
 ...
 ```
 
-from an unpacked [release tarball][rels].  From a built source tree of
-Infix the same functionality is bundled as:
+from an unpacked [release tarball][rels].  From a built source tree of Infix
+the same functionality is bundled as:
 
 ```
 $ make run
 ...
 ```
 
-To change settings, e.g. networking, <kbd>make run-menuconfig</kbd>, or
-from a pre-built Infix release tarball, using <kbd>./qemu/run.sh -c</kbd>
+To change settings, e.g. networking, RAM, or number of interfaces, use
+<kbd>make run-menuconfig</kbd> from a built source tree.  The same
+functionality is available from a release tarball as the optional `-c`
+argument: <kbd>./qemu/run.sh -c</kbd> brings up a menuconfig dialog, select
+`Exit` and save the changes, then start Qemu as usual.
+
+> [!NOTE]
+> The `-c` option requires the `kconfig-frontends` package, on
+> Debian/Ubuntu systems: <kbd>sudo apt install kconfig-frontends</kbd>
 
 The Infix test suite is built around Qemu and [Qeneth][qeth], see:
 
@@ -45,17 +52,24 @@ The Infix test suite is built around Qemu and [Qeneth][qeth], see:
 GNS3
 ----
 
-Download the [latest build][rels] of the `x86_64`, or `aarch64` if your
-host machine is Arm.  Unpack the tarball in a dedicated directory and
-use ["Import Appliance"][APPL] to install the `.gns3a` file into
-[GNS3][].
+The Infix appliance is available directly from the [GNS3 Marketplace][mket] --
+release tarballs no longer include a `.gns3a` file.  To [install it][APPL],
+open GNS3 and go to **File → New Template**, select *Install an appliance from
+the GNS3 server*, and search for Infix.  When asked for a disk image, click
+**Download** to fetch it directly, or point GNS3 to a `.qcow2` file downloaded
+from the [releases page][rels].
 
-Infix is in the "Router" category, it comes with 10 interfaces available
-by default for use as switch ports or routing.
+Infix is in the "Router" category, it comes with 10 interfaces available by
+default for use as switch ports or routing.
+
+For a complete walk-through, from installing GNS3 to building and verifying
+your first topology, see the blog post [Infix in GNS3][blog].
 
 [Qemu]: https://www.qemu.org/
 [GNS3]: https://gns3.com/
 [virt]: https://virt-manager.org/
 [rels]: https://github.com/kernelkit/infix/releases
 [qeth]: https://github.com/wkz/qeneth
-[APPL]: https://docs.gns3.com/docs/using-gns3/beginners/import-gns3-appliance/
+[mket]: https://gns3.com/marketplace/appliances/infix
+[blog]: https://www.kernelkit.org/posts/infix-in-gns3/
+[APPL]: https://docs.gns3.com/docs/using-gns3/beginners/install-from-marketplace/