diff --git a/ui/src/Components/MainModal/Help.js b/ui/src/Components/MainModal/Help.js
index 0b0e94dbe..88a1566b1 100644
--- a/ui/src/Components/MainModal/Help.js
+++ b/ui/src/Components/MainModal/Help.js
@@ -172,6 +172,25 @@ const Help = ({ defaultIsOpen }) => (
             </FilterExample>
           </QueryHelp>
 
+          <QueryHelp
+            title="Match alerts based on the Alertmanager cluster name"
+            operators={["=", "!=", "=~", "!~"]}
+          >
+            <FilterExample example="@cluster=production">
+              Match alerts collected from Alertmanager instances that are
+              members of the <code>prod</code> cluster.
+            </FilterExample>
+            <FilterExample example="@cluster!=staging">
+              Match alerts collected from Alertmanager instances that are not
+              members of the <code>staging</code> cluster.
+            </FilterExample>
+            <FilterExample example="@cluster=~prod">
+              Match alerts collected from Alertmanager instances that are
+              members of any cluster with name matching regular expression{" "}
+              <code>/.*prod.*/</code>.
+            </FilterExample>
+          </QueryHelp>
+
           <QueryHelp
             title="Match alerts based on the receiver name"
             operators={["=", "!=", "=~", "!~"]}
diff --git a/ui/src/Components/MainModal/__snapshots__/Help.test.js.snap b/ui/src/Components/MainModal/__snapshots__/Help.test.js.snap
index 58975074c..a3bbc47b3 100644
--- a/ui/src/Components/MainModal/__snapshots__/Help.test.js.snap
+++ b/ui/src/Components/MainModal/__snapshots__/Help.test.js.snap
@@ -426,6 +426,73 @@ exports[`<Help /> matches snapshot 1`] = `
             </li>
           </ul>
         </dd>
+        <dt>
+          Match alerts based on the Alertmanager cluster name
+        </dt>
+        <dd class=\\"mb-5\\">
+          <div>
+            Supported operators:
+            <kbd class=\\"mr-1\\">
+              =
+            </kbd>
+            <kbd class=\\"mr-1\\">
+              !=
+            </kbd>
+            <kbd class=\\"mr-1\\">
+              =~
+            </kbd>
+            <kbd class=\\"mr-1\\">
+              !~
+            </kbd>
+          </div>
+          <div>
+            Examples:
+          </div>
+          <ul>
+            <li>
+              <div>
+                <span class=\\"badge badge-info\\">
+                  @cluster=production
+                </span>
+              </div>
+              <div>
+                Match alerts collected from Alertmanager instances that are members of the
+                <code>
+                  prod
+                </code>
+                cluster.
+              </div>
+            </li>
+            <li>
+              <div>
+                <span class=\\"badge badge-info\\">
+                  @cluster!=staging
+                </span>
+              </div>
+              <div>
+                Match alerts collected from Alertmanager instances that are not members of the
+                <code>
+                  staging
+                </code>
+                cluster.
+              </div>
+            </li>
+            <li>
+              <div>
+                <span class=\\"badge badge-info\\">
+                  @cluster=~prod
+                </span>
+              </div>
+              <div>
+                Match alerts collected from Alertmanager instances that are members of any cluster with name matching regular expression
+                <code>
+                  /.*prod.*/
+                </code>
+                .
+              </div>
+            </li>
+          </ul>
+        </dd>
         <dt>
           Match alerts based on the receiver name
         </dt>