diff --git a/php/actualites.php b/php/actualites.php
index ab8b87d..cab6391 100644
--- a/php/actualites.php
+++ b/php/actualites.php
@@ -44,7 +44,8 @@ function build_news_feed(): string
         'Silly.be - Actualités',
         SITE . '/actualites',
         'Actualités de la commune de Silly (Belgique)',
-        $items
+        $items,
+        'https://sillycone-village.be/silly-rss/actualites.php'
     );
 }
 
diff --git a/php/agenda.php b/php/agenda.php
index f2006bb..adc792a 100644
--- a/php/agenda.php
+++ b/php/agenda.php
@@ -56,10 +56,14 @@ function build_events_feed(): string
         $meta = format_event_meta($item);
         $description = ($meta !== '' ? '<p>' . htmlspecialchars($meta, ENT_QUOTES, 'UTF-8') . '</p>' : '')
             . full_body_html($item);
+        // Un evenement recurrent partage le meme UID sur toutes ses
+        // occurrences (memes UID, dates differentes) : on suffixe le guid
+        // avec la date de debut pour rester unique par occurrence, comme
+        // l'exige la spec RSS.
         $items[] = [
             'title' => $title,
             'link' => SITE . '/agenda/' . slugify($title) . '?u=' . rawurlencode($uid),
-            'guid' => $uid,
+            'guid' => $uid . '-' . ($item['start'] ?? ''),
             'pubDate' => $item['created'] ?? $item['start'] ?? null,
             'description' => $description,
         ];
@@ -68,7 +72,8 @@ function build_events_feed(): string
         'Silly.be - Agenda',
         SITE . '/agenda',
         "Agenda / événements de la commune de Silly (Belgique)",
-        $items
+        $items,
+        'https://sillycone-village.be/silly-rss/agenda.php'
     );
 }
 
diff --git a/php/common.php b/php/common.php
index f4a3113..6688553 100644
--- a/php/common.php
+++ b/php/common.php
@@ -166,14 +166,17 @@ function xml_escape(string $text): string
 /**
  * Construit un flux RSS 2.0 complet a partir d'une liste d'items deja
  * formates (chacun un tableau title/link/guid/pubDate/description).
+ * $selfUrl est l'URL du flux lui-meme (atom:link rel="self", recommande
+ * par le validateur W3C).
  */
-function build_rss(string $title, string $link, string $description, array $items): string
+function build_rss(string $title, string $link, string $description, array $items, string $selfUrl): string
 {
     $now = rfc822(null);
     $xml = '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
-    $xml .= '<rss version="2.0">' . "\n  <channel>\n";
+    $xml .= '<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">' . "\n  <channel>\n";
     $xml .= '    <title>' . xml_escape($title) . "</title>\n";
     $xml .= '    <link>' . xml_escape($link) . "</link>\n";
+    $xml .= '    <atom:link href="' . xml_escape($selfUrl) . '" rel="self" type="application/rss+xml" />' . "\n";
     $xml .= '    <description>' . xml_escape($description) . "</description>\n";
     $xml .= "    <language>fr-be</language>\n";
     $xml .= "    <lastBuildDate>$now</lastBuildDate>\n";
diff --git a/silly_rss.py b/silly_rss.py
index 0339a4f..0fbec1a 100644
--- a/silly_rss.py
+++ b/silly_rss.py
@@ -37,6 +37,11 @@ MAX_PAGES = 2  # jusqu'a 40 items par flux
 NEWS_API = f"{SITE}/actualites/@results"
 EVENTS_API = f"{SITE}/agenda/@results"
 
+# Base publique ou ce script publie ses flux une fois deploye (voir
+# README.md, variante Yunohost/cron) - sert a l'atom:link rel="self".
+# A adapter si vous deployez ailleurs.
+SELF_BASE_URL = "https://akbar.nohost.me/silly-rss"
+
 
 def fetch_json(url: str) -> dict:
     result = subprocess.run(
@@ -170,11 +175,15 @@ def build_event_items() -> list[str]:
         meta = format_event_meta(item)
         description = (f"<p>{html.escape(meta)}</p>" if meta else "") + full_body_html(item)
         pub_dt = parse_dt(item.get("created") or item.get("start"))
+        # Un evenement recurrent partage le meme UID sur toutes ses
+        # occurrences : on suffixe le guid avec la date de debut pour
+        # rester unique par occurrence, comme l'exige la spec RSS.
+        occurrence_guid = f"{guid}-{item.get('start', '')}"
         entries.append(
             "    <item>\n"
             f"      <title>{escape(title)}</title>\n"
             f"      <link>{escape(link)}</link>\n"
-            f"      <guid isPermaLink=\"false\">{escape(guid)}</guid>\n"
+            f"      <guid isPermaLink=\"false\">{escape(occurrence_guid)}</guid>\n"
             f"      <pubDate>{rfc822(pub_dt)}</pubDate>\n"
             f"      <description>{escape(description)}</description>\n"
             "    </item>"
@@ -182,14 +191,15 @@ def build_event_items() -> list[str]:
     return entries
 
 
-def write_feed(path: str, title: str, link: str, description: str, items: list[str]) -> None:
+def write_feed(path: str, title: str, link: str, description: str, items: list[str], self_url: str) -> None:
     now = rfc822(datetime.now(timezone.utc))
     xml = (
         '<?xml version="1.0" encoding="UTF-8"?>\n'
-        '<rss version="2.0">\n'
+        '<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">\n'
         "  <channel>\n"
         f"    <title>{escape(title)}</title>\n"
         f"    <link>{escape(link)}</link>\n"
+        f'    <atom:link href="{escape(self_url)}" rel="self" type="application/rss+xml" />\n'
         f"    <description>{escape(description)}</description>\n"
         "    <language>fr-be</language>\n"
         f"    <lastBuildDate>{now}</lastBuildDate>\n"
@@ -211,6 +221,7 @@ def main() -> None:
         link=f"{SITE}/actualites",
         description="Actualités de la commune de Silly (Belgique)",
         items=news_items,
+        self_url=f"{SELF_BASE_URL}/actualites.xml",
     )
     print(f"[OK] actualites.xml : {len(news_items)} items")
 
@@ -221,6 +232,7 @@ def main() -> None:
         link=f"{SITE}/agenda",
         description="Agenda / événements de la commune de Silly (Belgique)",
         items=event_items,
+        self_url=f"{SELF_BASE_URL}/agenda.xml",
     )
     print(f"[OK] agenda.xml : {len(event_items)} items")