diff --git a/assets/sw.js b/assets/sw.js
index 0903383..c9ebaff 100644
--- a/assets/sw.js
+++ b/assets/sw.js
@@ -434,8 +434,12 @@ router.get('/api/bookmark', () => bookmarkFragment(''));
 //                   straight in and processes no out-of-band elements -- and
 //                   when a worker first appears under a page boot.html
 //                   composed.
-//   chapter=ch3     the verses of that chapter, and land on the chapter.
-//   verse=v3_16     the same verses, that one selected, and land on the verse.
+//   at=ch3          the verses of that chapter, and land on the chapter.
+//   at=v3_16        the same verses, that one selected, and land on the verse.
+//
+// One parameter for both selects: at is the id of the element to land on, and
+// ch3 and v3_16 are told apart by their shape. Which select it came from is
+// not a second fact.
 //
 // Neither the book nor the anchor is in the URL, deliberately. Both come from
 // HX-Current-URL, which htmx sets from location.href on every request it
@@ -467,19 +471,17 @@ router.get('/api/bookmark', () => bookmarkFragment(''));
 router.get('/api/reference', async (call) => {
   const params = call.url.searchParams;
   const page = call.currentUrl();
-  // Which select the reader moved, if either did -- by whether the parameter
-  // is there, not by whether it says anything. A select posts an empty value
-  // when it has no options, and reading that as "no select moved" answers it
-  // with a whole picker: htmx swaps a <div> into a <select>, which renders as
-  // nothing, and the select is then empty for good -- every change after that
-  // posts the same empty value and gets the same answer.
+  // Set when a select was moved -- by whether the parameter is there, not by
+  // whether it says anything. A select posts an empty value when it has no
+  // options, and reading that as "no select moved" answers it with a whole
+  // picker: htmx swaps a <div> into a <select>, which renders as nothing, and
+  // the select is then empty for good -- every change after that posts the
+  // same empty value and gets the same answer.
   //
   // An empty value is still an answerable question. It names no chapter, so it
   // gets chapter 1, which is what everything here does with an anchor it
   // cannot read.
-  const moved = params.has('verse') ? params.get('verse')
-    : params.has('chapter') ? params.get('chapter')
-    : null;
+  const moved = params.has('at') ? params.get('at') : null;
 
   // The address bar is the fallback, and only that: once a select has been
   // used it is the one saying where to go, and HX-Replace-Url has not caught
diff --git a/assets/templates/reference.njk b/assets/templates/reference.njk
index 0f25e19..c4f48b3 100644
--- a/assets/templates/reference.njk
+++ b/assets/templates/reference.njk
@@ -59,10 +59,14 @@
      to know how a verse anchor is spelled -- including the worker, which
      reads the chapter back out of the id it sent.
 
+     Which is why both selects post under the same name. ch3 and v3_16 are
+     told apart by their shape, so a second name saying which select it came
+     from would only be repeating what the value already says.
+
      hx-target is spelled out on both selects because the one on the div above
      is "this", and an inherited "this" would resolve to the select. #}
   <select class="reference-chapter form-select form-select-sm"
-          id="reference-chapter" name="chapter"
+          id="reference-chapter" name="at"
           hx-get="api/reference" hx-target="#reference-verse"
           hx-swap="innerHTML">
   {%- for chapter in reference.chapters %}
@@ -76,7 +80,7 @@
      has something to hang the scroll on -- and so the option the reader chose
      comes back marked selected instead of being reset by the swap. #}
   <select class="reference-verse form-select form-select-sm"
-          id="reference-verse" name="verse"
+          id="reference-verse" name="at"
           hx-get="api/reference" hx-target="this" hx-swap="innerHTML">
 {% include "verses.njk" %}
   </select>