--- a/testing/geckodriver/doc/Support.md
+++ b/testing/geckodriver/doc/Support.md
@@ -1,11 +1,68 @@
 Supported platforms
 ===================
 
+The following table shows a mapping between [geckodriver releases],
+supported versions of Firefox, and required Selenium version:
+
+<table>
+ <thead>
+  <tr>
+    <th rowspan="2">geckodriver
+    <th rowspan="2">Selenium
+    <th colspan="2">Supported versions of Firefox
+  </tr>
+  <tr>
+    <th>min
+    <th>max
+  </tr>
+ </thead>
+
+ <tr>
+  <td>0.22.0
+  <td>≥ 3.11 (3.14 Python)
+  <td>57
+  <td>n/a
+ <tr>
+  <td>0.21.0
+  <td>≥ 3.11 (3.14 Python)
+  <td>57
+  <td>n/a
+ <tr>
+  <td>0.20.1
+  <td>≥ 3.5
+  <td>55
+  <td>62
+ <tr>
+  <td>0.20.0
+  <td>≥ 3.5
+  <td>55
+  <td>62
+ <tr>
+  <td>0.19.1
+  <td>≥ 3.5
+  <td>55
+  <td>62
+ <tr>
+  <td>0.19.0
+  <td>≥ 3.5
+  <td>55
+  <td>62
+ <tr>
+  <td>0.18.0
+  <td>≥ 3.4
+  <td>53
+  <td>62
+ <tr>
+  <td>0.17.0
+  <td>≥ 3.4
+  <td>52
+  <td>62
+
 
 Clients
 -------
 
 [Selenium] users must update to version 3.11 or later to use geckodriver.
 Other clients that follow the [W3C WebDriver specification][WebDriver]
 are also supported.
 
@@ -23,16 +80,17 @@ We also keep track of known [Selenium], 
 Support is best in Firefox 57 and greater, although generally the more
 recent the Firefox version, the better the experience as they have
 more bug fixes and features.  Some features will only be available
 in the most recent Firefox versions, and we strongly advise using the
 latest [Firefox Nightly] with geckodriver.  Since Windows XP support
 in Firefox was dropped with Firefox 53, we do not support this platform.
 
 
+[geckodriver releases]: https://github.com/mozilla/geckodriver/releases
 [Selenium]: https://github.com/seleniumhq/selenium
 [WebDriver]: https://w3c.github.io/webdriver/
 [implementation status]: https://bugzilla.mozilla.org/showdependencytree.cgi?id=721859&hide_resolved=1
 [Firefox Nightly]: https://whattrainisitnow.com/
 [remote protocol]: https://github.com/mozilla/geckodriver/issues?q=is%3Aissue+is%3Aopen+label%3Amarionette
 [specification]: https://github.com/mozilla/geckodriver/issues?q=is%3Aissue+is%3Aopen+label%3Aspec
 [issue tracker]: https://github.com/mozilla/geckodriver/issues
 [Firefox Nightly]: https://nightly.mozilla.org/