diff --git a/README.html b/README.html
index c9cca01..2b9971f 100644
--- a/README.html
+++ b/README.html
@@ -38,7 +38,7 @@
 <li><code>sudo apt-get install libssl-dev libplist-dev</code> (unless you need to build OpenSSL and libplist from source).</li>
 <li><code>sudo apt-get install libavahi-compat-libdnssd-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev</code>.</li>
 <li><code>sudo apt-get install libx11-dev</code> (only needed if you invoke the “ZOOMFIX” X11 display-name fix in the next step)</li>
-<li><code>cmake .</code> (or “<code>cmake -DZOOMFIX=ON .</code>” to get a screen-sharing fix to make X11 mirror display windows visible to screen-sharing applications such as Zoom, see <a href="#improvements">Improvements</a> #3 below).</li>
+<li><code>cmake .</code> (or “<code>cmake -DZOOMFIX=ON .</code>” to get a screen-sharing fix to make X11 mirror display windows visible to screen-sharing applications such as Zoom, see <a href="#improvements">Improvements</a> #3 below). <strong>This is only needed for GStreamer-1.18.x or earlier</strong>.</li>
 <li><code>make</code></li>
 <li><code>sudo make install</code> (you can afterwards uninstall with <code>sudo make uninstall</code> in the same directory in which this was run)</li>
 <li>Install GStreamer plugins that you need: <code>sudo apt-get install gstreamer1.0-&lt;plugin&gt;</code>; values of <code>&lt;plugin&gt;</code> needed are: “plugins-base”, “libav” (for sound), “plugins-good” (for v4l2 hardware h264 decoding) and “plugins-bad” (for software h264 decoding). Also needed may be “gl” for OpenGL support, and “x” for X11 support, although these may already be installed; “vaapi” is needed for hardware-accelerated h264 video decoding by Intel graphics (not for NVIDIA). Also install “tools” to get the utility gst-inspect-1.0 for examining the GStreamer installation.</li>
diff --git a/README.md b/README.md
index b8742bb..cc3f4eb 100644
--- a/README.md
+++ b/README.md
@@ -140,7 +140,8 @@ not the case, as when you are packaging for a distribution, use the cmake option
 3. `sudo apt-get install libx11-dev`  (only needed if you invoke the "ZOOMFIX" X11 display-name fix in the next step)
 4. `cmake .` (or "`cmake -DZOOMFIX=ON .`" to get a screen-sharing fix to
 make X11 mirror display windows visible to screen-sharing applications such as
-Zoom, see [Improvements](#improvements) \#3 below).
+Zoom, see [Improvements](#improvements) \#3 below). **This is only needed
+for GStreamer-1.18.x or earlier**.
 5. `make`
 6. `sudo make install`    (you can afterwards uninstall with `sudo make uninstall` in the same directory in which this was run)
 7.  Install GStreamer plugins that you need: `sudo apt-get install gstreamer1.0-<plugin>`; values of
diff --git a/README.txt b/README.txt
index 262b743..e8043e8 100644
--- a/README.txt
+++ b/README.txt
@@ -186,7 +186,7 @@ packaging for a distribution, use the cmake option
 4.  `cmake .` (or "`cmake -DZOOMFIX=ON .`" to get a screen-sharing fix
     to make X11 mirror display windows visible to screen-sharing
     applications such as Zoom, see [Improvements](#improvements) \#3
-    below).
+    below). **This is only needed for GStreamer-1.18.x or earlier**.
 5.  `make`
 6.  `sudo make install` (you can afterwards uninstall with
     `sudo make uninstall` in the same directory in which this was run)