diff --git a/docs/_stylesheets/filter_tool.css b/docs/_stylesheets/filter_tool.css
index a4203eea..c2bbb481 100644
--- a/docs/_stylesheets/filter_tool.css
+++ b/docs/_stylesheets/filter_tool.css
@@ -82,15 +82,63 @@
   background: var(--filter-soft);
 }
 
-.filter-example-primer p {
+.filter-example-primer > p {
   margin: 0;
   color: color-mix(in srgb, var(--md-default-fg-color) 76%, transparent);
   font-size: 0.72rem;
   line-height: 1.45;
 }
 
-.filter-example-primer p + p {
-  margin-top: 0.35rem;
+.filter-primer-tables {
+  display: grid;
+  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
+  gap: 0.6rem;
+  align-items: start;
+  margin-top: 0.5rem;
+}
+
+.filter-primer-table {
+  width: 100%;
+  margin: 0 !important;
+  border-collapse: collapse;
+  border: 1px solid var(--filter-border);
+  background: var(--md-default-bg-color);
+  font-size: 0.68rem;
+  line-height: 1.35;
+}
+
+.filter-primer-table caption {
+  padding: 0 0 0.3rem;
+  color: var(--md-default-fg-color);
+  font-size: 0.7rem;
+  font-weight: 800;
+  text-align: left;
+}
+
+.filter-primer-table th,
+.filter-primer-table td {
+  padding: 0.32rem 0.4rem;
+  border: 1px solid var(--filter-border);
+  text-align: left;
+  vertical-align: top;
+}
+
+.filter-primer-table th {
+  background: var(--filter-soft);
+  font-weight: 800;
+}
+
+.filter-primer-table th:first-child,
+.filter-primer-table td:first-child {
+  width: 38%;
+}
+
+.filter-primer-table code {
+  white-space: nowrap;
+}
+
+.filter-example-primer > .filter-primer-note {
+  margin-top: 0.45rem;
 }
 
 .filter-example-grid {
@@ -743,6 +791,10 @@
 }
 
 @media (max-width: 62rem) {
+  .filter-primer-tables {
+    grid-template-columns: 1fr;
+  }
+
   .filter-tool-grid {
     grid-template-columns: 1fr;
   }
diff --git a/docs/filter_tool.md b/docs/filter_tool.md
index 2e5518fe..79d7c7ea 100644
--- a/docs/filter_tool.md
+++ b/docs/filter_tool.md
@@ -42,22 +42,42 @@ in the simulator below. The examples draw from
       <p>
         Read each summary as <code>when</code> all conditions match,
         <code>do</code> the actions. A match alone does not stop forwarding.
-        <code>hops=3+</code> means the rule applies at a received hop count of
-        three or more.
       </p>
-      <p>
-        <code>type=grp_data</code> matches one payload type.
-        <code>type=any</code> matches every payload.
-        <code>type=class:group</code> matches group text and data;
-        <code>type=class:login</code> matches REQ, RESPONSE, TXT_MSG, ANON_REQ,
-        and PATH; <code>type=class:other</code> matches everything else.
-      </p>
-      <p>
-        <code>channel=</code>, <code>rx.scope=</code>, <code>path=</code>, and
-        <code>tempradio=</code> further narrow a match. After <code>do</code>,
-        <code>drop</code> prevents retransmission, <code>scope=</code> sets the
-        outgoing transport scope, <code>rate=</code> limits matches per minute,
-        and <code>timing=</code> selects the schedule.
+      <div class="filter-primer-tables">
+        <table class="filter-primer-table">
+          <caption>Payload selectors</caption>
+          <thead>
+            <tr><th><code>type=</code> value</th><th>Matches</th></tr>
+          </thead>
+          <tbody>
+            <tr><td><code>grp_data</code></td><td>Only the named payload type</td></tr>
+            <tr><td><code>any</code></td><td>Every payload type</td></tr>
+            <tr><td><code>class:group</code></td><td>GRP_TXT and GRP_DATA</td></tr>
+            <tr><td><code>class:login</code></td><td>REQ, RESPONSE, TXT_MSG, ANON_REQ, and PATH</td></tr>
+            <tr><td><code>class:other</code></td><td>Every remaining payload type</td></tr>
+          </tbody>
+        </table>
+        <table class="filter-primer-table">
+          <caption>Other conditions and actions</caption>
+          <thead>
+            <tr><th>Field</th><th>Meaning</th></tr>
+          </thead>
+          <tbody>
+            <tr><td><code>hops=</code></td><td>Received hop count: <code>all</code>, <code>3+</code>, <code>2-6</code>, or <code>3</code></td></tr>
+            <tr><td><code>channel=</code></td><td>Group channel</td></tr>
+            <tr><td><code>rx.scope=</code></td><td>Original incoming transport scope</td></tr>
+            <tr><td><code>path=</code></td><td>Path prefix, blacklist, bucket, or loop match</td></tr>
+            <tr><td><code>tempradio=</code></td><td>Temporary-radio state</td></tr>
+            <tr><td><code>do drop</code></td><td>Do not retransmit</td></tr>
+            <tr><td><code>do scope=</code></td><td>Set the outgoing transport scope</td></tr>
+            <tr><td><code>do rate=</code></td><td>Apply a per-minute rate and burst</td></tr>
+            <tr><td><code>do timing=</code></td><td>Select fast, normal, or slow scheduling</td></tr>
+          </tbody>
+        </table>
+      </div>
+      <p class="filter-primer-note">
+        There is no <code>class:txt</code>. Use <code>type=grp_txt</code> for
+        channel text or <code>type=txt_msg</code> for peer text.
       </p>
     </div>
     <div class="filter-example-grid">