diff --git a/docs/upgrade-guides/3-0-0-to-3-1-0.md b/docs/upgrade-guides/3-0-0-to-3-1-0.md
new file mode 100644
index 0000000..70bd183
--- /dev/null
+++ b/docs/upgrade-guides/3-0-0-to-3-1-0.md
@@ -0,0 +1,4 @@
+# 3.0.0 to 3.1.0
+
+The **Procedural Scheduling API** has one breaking change in Aerie `v3.1.0`: the functionality of `filterLongerThan` and `filterShorterThan` methods have been **inverted** to be more consistent with other `filter` methods. `filterLongerThan(duration)` will now *include* all events longer than `duration`, not *remove* them. See [aerie-ui#1587](https://github.com/NASA-AMMOS/aerie/pull/1587) for details. If you are using these functions in your code, you should invert them as needed to achieve the same functionality in `v3.1.0`.
+
diff --git a/sidebars.js b/sidebars.js
index ece7eb7..8134761 100644
--- a/sidebars.js
+++ b/sidebars.js
@@ -446,6 +446,7 @@ const sidebars = {
     },
   ],
   upgradeGuides: [
+    'upgrade-guides/3-0-0-to-3-1-0',
     'upgrade-guides/2-21-0-to-3-0-0',
     'upgrade-guides/2-20-0-to-2-21-0',
     'upgrade-guides/2-19-0-to-2-20-0',
diff --git a/static/mgss-cover-page.html b/static/mgss-cover-page.html
index 14e9b5b..5f24051 100644
--- a/static/mgss-cover-page.html
+++ b/static/mgss-cover-page.html
@@ -35,7 +35,7 @@ <h2>Identification</h2>
               <td>636.101</td>
               <td>MPSA</td>
               <td>Aerie</td>
-              <td id="aerie-version">3.0.0</td>
+              <td id="aerie-version">3.1.0</td>
             </tr>
           </tbody>
         </table>