diff --git a/.github/workflows/sync-icon-sets.yml b/.github/workflows/sync-icon-sets.yml
index 27704b2..9afd982 100644
--- a/.github/workflows/sync-icon-sets.yml
+++ b/.github/workflows/sync-icon-sets.yml
@@ -73,7 +73,8 @@ jobs:
           # the first run after a merge passed and every run after it failed.
           git fetch origin "+refs/heads/$BRANCH:refs/remotes/origin/$BRANCH" || true
           git checkout -B "$BRANCH"
-          git add icon-sets.json
+          # The sync sets docs/installation.md's pack-table counts from the catalogue too.
+          git add icon-sets.json docs/installation.md
           git commit -m 'docs: sync icon-sets catalog' || true
           # Lease kept rather than dropped for --force: it still refuses to clobber a
           # push that arrived after the fetch above, which is the case it exists for.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 923a3b9..bff3fe3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@ All notable changes to `ichava/core` follow [Keep a Changelog](https://keepachan
 
 ### Fixed
 
+- **The nightly catalogue sync updates the installation guide's pack table with the catalogue.** `bin/sync-icon-sets.php` rewrote `icon-sets.json` alone, so a count change opened a pull request that `InstallationPackTableTest` failed: #179 moved tabler to 6,287 and openmoji to 8,990 while `docs/installation.md` still said 6,257 and 8,568. After writing the catalogue, the script now sets each table row's count from it with `withPackTableCounts()`, and the workflow commits both files. Rows, order and repositories are left as written, so a set added or removed still fails the table test. `tests/Unit/SyncIconSetsDocTableTest.php` covers it (proven red by leaving the counts alone).
 - **The nightly catalogue sync no longer puts Twemoji's pre-split values back.** `bin/sync-icon-sets.php` reads each pack at its latest tag, and `icon-sets-twemoji`'s `v0.1.0` still holds OpenMoji, so #176 proposed 10,567 "Emoji Sets" over the recorded 3,435 "Twemoji". A set in `icon-sets.json` may now carry a `hold` (`tag`, `commit`, `reason`): while that tag is the latest release at that commit the sync keeps the set's snapshot, and the hold drops itself once a newer tag is cut or the tag moves. The twemoji set is held at `v0.1.0`. `tests/Unit/SyncIconSetsHoldTest.php` covers it (proven red by ignoring the commit).
 - **A pack listed with the application boots again.** `PackConfigCache` resolved the cache store when it was built, and a pack's constants class builds it while the providers are still registering, before the store exists, so every pack failed to boot with `Target class [cache] does not exist` (found running the packs against #172). The store is now resolved when it is used. Core's own pack tests registered their fixture after boot, which is why none saw it; `tests/Feature/PackBootsInProviderListTest.php` lists the fixture with the application.
 - **`InformationService::discoverPackages()` finds the installed packs.** It globbed `vendor/*/ichava-*`, which matches no pack (packs install as `vendor/ichava/icon-sets-*`), and reported `registered` through `IconRegistry::has()`, which looks up an icon, not a package, so `ichava::ichava-core.info discover` listed nothing. It now asks `Composer\InstalledVersions` for every package of type `ichava-icon-set` and reports `registered` through `IconRegistry::isRegistered()`. The signature and return shape are unchanged. A pack is identified by its composer type and nothing else (owner, 2026-11-05): the `vendor/*/ichava-*` directory glob is removed, since no pack in the estate matched it, and the `platform/ichava` scan now keeps only a directory whose composer.json declares `ichava-icon-set`, keyed by that file's `name` instead of `ichava/<directory>`. A checkout there without the type is no longer listed. `tests/Feature/InstalledPackDiscoveryTest.php`.
diff --git a/bin/sync-icon-sets.php b/bin/sync-icon-sets.php
index eebc103..250da9f 100755
--- a/bin/sync-icon-sets.php
+++ b/bin/sync-icon-sets.php
@@ -31,10 +31,10 @@
 
 // Run only when executed as a script, so the functions below can be loaded and tested on their own.
 if (realpath((string) ($_SERVER['SCRIPT_FILENAME'] ?? '')) === __FILE__) {
-    exit(main(dirname(__DIR__) . '/icon-sets.json'));
+    exit(main(dirname(__DIR__) . '/icon-sets.json', dirname(__DIR__) . '/docs/installation.md'));
 }
 
-function main(string $manifestPath): int
+function main(string $manifestPath, ?string $docPath = null): int
 {
     $raw = @file_get_contents($manifestPath);
 
@@ -113,9 +113,48 @@ function main(string $manifestPath): int
     file_put_contents($manifestPath, $encoded . "\n");
     echo "Wrote {$manifestPath}\n";
 
+    // docs/installation.md shows each set's count, and InstallationPackTableTest fails when it
+    // disagrees with the catalogue. Writing the catalogue alone opened a pull request that
+    // could never go green (core#179), so the table moves with it.
+    if ($docPath !== null && is_file($docPath)) {
+        $doc = (string) file_get_contents($docPath);
+        $updated = withPackTableCounts($doc, $manifest['sets']);
+
+        if ($updated !== $doc) {
+            file_put_contents($docPath, $updated);
+            echo "Wrote {$docPath}\n";
+        }
+    }
+
     return 0;
 }
 
+/**
+ * The installation guide with each pack-table row's count set from the catalogue.
+ *
+ * Only the count cell of a row whose package is in the catalogue changes; rows, order and
+ * repositories are left as written, so a set added or removed still fails the table test
+ * rather than being papered over here.
+ *
+ * @param list<array<string, mixed>> $sets
+ */
+function withPackTableCounts(string $doc, array $sets): string
+{
+    $counts = [];
+
+    foreach ($sets as $set) {
+        if (isset($set['package'], $set['icon_count']) && is_int($set['icon_count'])) {
+            $counts[(string) $set['package']] = number_format($set['icon_count']);
+        }
+    }
+
+    return (string) preg_replace_callback(
+        '/^(\| `(ichava\/[\w-]+)` \| )([^|]+?)( \| `https:\/\/github\.com\/[\w\/.-]+` \|)$/m',
+        static fn (array $m): string => isset($counts[$m[2]]) ? $m[1] . $counts[$m[2]] . $m[4] : $m[0],
+        $doc,
+    );
+}
+
 /**
  * The catalogue without its sync timestamp, for comparing two runs.
  *
diff --git a/tests/Unit/SyncIconSetsDocTableTest.php b/tests/Unit/SyncIconSetsDocTableTest.php
new file mode 100644
index 0000000..3a2101b
--- /dev/null
+++ b/tests/Unit/SyncIconSetsDocTableTest.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+// bin/sync-icon-sets.php rewrote icon-sets.json alone, so a count change opened a
+// pull request that InstallationPackTableTest failed (core#179: tabler 6,257 -> 6,287,
+// openmoji 8,568 -> 8,990). The sync now sets the guide's count cells from the
+// catalogue it writes.
+
+require_once dirname(__DIR__, 2) . '/bin/sync-icon-sets.php';
+
+function docTable(string $tabler, string $openmoji): string
+{
+    return "Intro.\n\n| Package | Icons | Repository |\n|---|---|---|\n"
+        . "| `ichava/icon-sets-tabler` | {$tabler} | `https://github.com/ichava/icon-sets-tabler` |\n"
+        . "| `ichava/icon-sets-openmoji` | {$openmoji} | `https://github.com/ichava/icon-sets-openmoji` |\n"
+        . "\nOutro mentions 6,257 icons.\n";
+}
+
+it('sets each row count from the catalogue', function () {
+    $sets = [
+        ['package' => 'ichava/icon-sets-tabler', 'icon_count' => 6287],
+        ['package' => 'ichava/icon-sets-openmoji', 'icon_count' => 8990],
+    ];
+
+    expect(withPackTableCounts(docTable('6,257', '8,568'), $sets))->toBe(docTable('6,287', '8,990'));
+});
+
+it('leaves a row the catalogue does not name, and the prose around the table', function () {
+    $doc = docTable('6,257', '8,568');
+
+    expect(withPackTableCounts($doc, [['package' => 'ichava/icon-sets-tabler', 'icon_count' => 6257]]))->toBe($doc)
+        ->and(withPackTableCounts($doc, []))->toBe($doc);
+});
+
+it('keeps the real guide in step with the real catalogue', function () {
+    $root = dirname(__DIR__, 2);
+    $sets = json_decode((string) file_get_contents($root . '/icon-sets.json'), true, flags: JSON_THROW_ON_ERROR)['sets'];
+    $doc = (string) file_get_contents($root . '/docs/installation.md');
+
+    expect(withPackTableCounts($doc, $sets))->toBe($doc);
+});