diff --git a/TODO.md b/TODO.md
index 8adf3a7..e3f0ccb 100644
--- a/TODO.md
+++ b/TODO.md
@@ -39,6 +39,21 @@
 - [x] Update `root` directive in `nginx/posterg.conf`
 - [x] Update `STORAGE_ROOT` production path in `app/bootstrap.php`
 
+## Form Help Blocks (student-facing explanatory text)
+
+- [x] Migration `004_add_form_help_blocks.sql` — `form_help_blocks` table with 8 seeded keys
+- [x] `Database` methods: `getFormHelpBlock`, `setFormHelpBlock`, `getAllFormHelpBlocks`, `FORM_HELP_KEYS`, `FORM_HELP_LABELS`
+- [x] `actions/form-help.php` — CSRF-validated save handler
+- [x] `actions/page.php` — CSRF-validated save handler for static pages (was missing)
+- [x] `contenus.php` controller — load `$formHelpBlocks`, add CSRF token
+- [x] `contenus-edit.php` controller — handle `?form_block=<key>` route
+- [x] `templates/admin/contenus.php` — flash messages + form help blocks table with edit links
+- [x] `templates/admin/contenus-edit.php` — `form_help` edit branch with OverType Markdown editor
+- [x] `templates/partials/form/form-help-block.php` — renders Markdown block via Parsedown (safe mode), silent on empty
+- [x] `partage/index.php` — load all blocks once, inject at all 8 positions (replaced TODO comments)
+- [x] `form.css` — `.form-help-block` styled with accent left-border
+- [x] `admin.css` — `.muted` utility class
+
 ## Centralise Form Templates
 
 - [x] Extract shared fieldset partials: `fieldset-tfe-info.php`, `fieldset-academic.php`, `fieldset-files.php`, `fieldset-metadata.php`, `fieldset-licence-explanation.php`
diff --git a/app/public/admin/actions/page.php b/app/public/admin/actions/page.php
new file mode 100644
index 0000000..804d27d
--- /dev/null
+++ b/app/public/admin/actions/page.php
@@ -0,0 +1,39 @@
+<?php
+/**
+ * Save handler for static page content (Markdown).
+ */
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+AdminAuth::requireLogin();
+
+if (!isset($_POST['csrf_token'], $_SESSION['csrf_token'])
+    || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
+    App::flash('error', 'Erreur de sécurité : token invalide.');
+    header('Location: /admin/contenus.php');
+    exit;
+}
+
+$allowedSlugs = ['about', 'licenses', 'charte'];
+$slug         = $_POST['slug'] ?? '';
+$content      = $_POST['content'] ?? '';
+
+if (!in_array($slug, $allowedSlugs, true)) {
+    App::flash('error', 'Slug de page invalide.');
+    header('Location: /admin/contenus.php');
+    exit;
+}
+
+require_once APP_ROOT . '/src/Database.php';
+$db = new Database();
+
+try {
+    $db->savePage($slug, $content);
+    App::flash('success', 'Page « ' . htmlspecialchars($slug) . ' » mise à jour.');
+} catch (Exception $e) {
+    error_log('page save error: ' . $e->getMessage());
+    App::flash('error', 'Erreur lors de la sauvegarde : ' . htmlspecialchars($e->getMessage()));
+}
+
+$_SESSION['csrf_token'] = bin2hex(random_bytes(32));
+header('Location: /admin/contenus.php');
+exit;
diff --git a/app/public/assets/css/admin.css b/app/public/assets/css/admin.css
index ca9d000..51a8411 100644
--- a/app/public/assets/css/admin.css
+++ b/app/public/assets/css/admin.css
@@ -1643,3 +1643,10 @@
 
 
 /* ── Form group, student mode, thanks page → see form.css ───────────────── */
+
+/* ── Utility ─────────────────────────────────────────────────────────────── */
+
+.muted {
+    color: var(--text-secondary);
+    font-style: italic;
+}
diff --git a/app/public/assets/css/form.css b/app/public/assets/css/form.css
index 1fe6a5a..190d254 100644
--- a/app/public/assets/css/form.css
+++ b/app/public/assets/css/form.css
@@ -786,3 +786,26 @@ a.recap-file-name:hover {
     background: var(--accent-secondary);
     transform: translateY(-1px);
 }
+
+
+/* ── Form help blocks ────────────────────────────────────────────────────── */
+
+.form-help-block {
+    background: color-mix(in srgb, var(--accent-primary) 8%, transparent);
+    border-left: 3px solid var(--accent-primary);
+    border-radius: 0 6px 6px 0;
+    padding: var(--space-s) var(--space-m);
+    margin-bottom: var(--space-s);
+    font-size: var(--step--1);
+    color: var(--text-primary);
+    line-height: 1.6;
+}
+
+.form-help-block > *:first-child { margin-top: 0; }
+.form-help-block > *:last-child  { margin-bottom: 0; }
+
+.form-help-block p  { margin: 0 0 var(--space-xs); }
+.form-help-block ul,
+.form-help-block ol { margin: 0 0 var(--space-xs); padding-left: var(--space-m); }
+.form-help-block li { margin-bottom: var(--space-3xs); }
+.form-help-block a  { color: var(--accent-primary); }
diff --git a/app/public/partage/index.php b/app/public/partage/index.php
index 7b0f6ce..25cd92c 100644
--- a/app/public/partage/index.php
+++ b/app/public/partage/index.php
@@ -210,6 +210,10 @@ function renderShareLinkForm(string $slug, array $link): void
     $shareOldFn = fn(string $key, string $default = '') => old($formData, $key, $default);
     // No autofocus in the share form — identity function.
     $shareWithAutofocusFn = fn(string $field, array $attrs = []) => $attrs;
+
+    // Load all form help blocks in one query.
+    $helpBlocks = Database::getInstance()->getAllFormHelpBlocks();
+    $helpFn = fn(string $key) => $helpBlocks[$key]['content'] ?? '';
     ?>
     <!DOCTYPE html>
     <html lang="fr">
@@ -243,9 +247,7 @@ function renderShareLinkForm(string $slug, array $link): void
             <div class="flash-success" role="alert"><?= htmlspecialchars($flashSuccess) ?></div>
             <?php endif; ?>
 
-            <!-- TODO: Add an introductory block here explaining the purpose of this form
-                 to students: what xamxam is, what happens after submission, who can see
-                 their work, and the general timeline before publication. -->
+            <?php $helpContent = $helpFn('partage_intro'); include APP_ROOT . '/templates/partials/form/form-help-block.php'; ?>
 
             <p class="required-note"><span class="asterisk">*</span> Champs obligatoires</p>
             <form action="/partage/<?= urlencode($slug) ?>/submit" method="post" enctype="multipart/form-data" class="admin-form">
@@ -253,13 +255,15 @@ function renderShareLinkForm(string $slug, array $link): void
 
                 <!-- ═══════════════════ Informations du TFE ═══════════════════ -->
                 <?php
-                // TODO: Add a student-facing explanation block for each fieldset below,
-                //       describing what information is expected and why it is collected.
                 $oldFn           = $shareOldFn;
                 $withAutofocusFn = $shareWithAutofocusFn;
-                // TODO: Add a contextual note for the synopsis field explaining the
-                //       expected length, tone, and whether it will be publicly visible.
-                $synopsisExtra   = '';
+                // Inject fieldset intro note and synopsis-specific note via the partial's hook.
+                ob_start();
+                $helpContent = $helpFn('fieldset_synopsis');
+                include APP_ROOT . '/templates/partials/form/form-help-block.php';
+                $synopsisExtra = ob_get_clean();
+                $helpContent = $helpFn('fieldset_tfe_info');
+                include APP_ROOT . '/templates/partials/form/form-help-block.php';
                 include APP_ROOT . '/templates/partials/form/fieldset-tfe-info.php';
                 ?>
 
@@ -279,9 +283,8 @@ function renderShareLinkForm(string $slug, array $link): void
                         ];
                     }
                 }
-                // TODO: Add a note explaining the jury composition to students:
-                //       who counts as external, what role each member plays, and
-                //       whether this information will be publicly visible.
+                $helpContent = $helpFn('fieldset_jury');
+                include APP_ROOT . '/templates/partials/form/form-help-block.php';
                 require APP_ROOT . '/templates/partials/form/jury-fieldset.php';
                 ?>
 
@@ -289,17 +292,15 @@ function renderShareLinkForm(string $slug, array $link): void
                 <?php
                 $oldFn           = $shareOldFn;
                 $withAutofocusFn = $shareWithAutofocusFn;
-                // TODO: Add a note for the academic context fieldset clarifying what
-                //       orientation/AP/finality values correspond to, and where students
-                //       can look them up if unsure.
+                $helpContent = $helpFn('fieldset_academic');
+                include APP_ROOT . '/templates/partials/form/form-help-block.php';
                 include APP_ROOT . '/templates/partials/form/fieldset-academic.php';
                 ?>
 
                 <!-- ═══════════════════ Fichiers ═══════════════════ -->
                 <?php
-                // TODO: Add a note before the files fieldset explaining accepted formats,
-                //       max sizes, what a cover image should look like, and that files
-                //       will only be accessible according to the chosen access level.
+                $helpContent = $helpFn('fieldset_files');
+                include APP_ROOT . '/templates/partials/form/form-help-block.php';
                 include APP_ROOT . '/templates/partials/form/fieldset-files.php';
                 ?>
 
@@ -309,10 +310,8 @@ function renderShareLinkForm(string $slug, array $link): void
                 $withAutofocusFn     = $shareWithAutofocusFn;
                 $showDescription     = false;
                 $defaultAccessTypeId = 2;
-                // TODO: Add an explanation of each access level (Libre / Interne / Interdit)
-                //       close to the "Visibilité / Accès" select so students understand
-                //       the implications before choosing. Cross-reference the licence
-                //       fieldset below.
+                $helpContent = $helpFn('fieldset_access');
+                include APP_ROOT . '/templates/partials/form/form-help-block.php';
                 include APP_ROOT . '/templates/partials/form/fieldset-metadata.php';
                 ?>
 
@@ -322,8 +321,7 @@ function renderShareLinkForm(string $slug, array $link): void
                 <!-- ═══════════════════ E-mail de confirmation ═══════════ -->
                 <fieldset>
                     <legend>E-mail de confirmation</legend>
-                    <!-- TODO: Add a sentence explaining that the confirmation email is only
-                         used to send the submission recap and will not be shared publicly. -->
+                    <?php $helpContent = $helpFn('fieldset_email'); include APP_ROOT . '/templates/partials/form/form-help-block.php'; ?>
                     <?php
                     $name  = 'confirmation_email';
                     $label = 'Adresse e-mail * :';
diff --git a/app/templates/admin/contenus.php b/app/templates/admin/contenus.php
index 94001e1..99ecd42 100644
--- a/app/templates/admin/contenus.php
+++ b/app/templates/admin/contenus.php
@@ -2,14 +2,13 @@
     <h1>Contenus</h1>
 
     <?php
-    $flashSuccess = App::consumeFlash('success');
-    $flashError   = App::consumeFlash('error');
+    $flash = App::consumeFlash();
     ?>
-    <?php if ($flashSuccess): ?>
-    <div class="flash-success" role="alert"><?= htmlspecialchars($flashSuccess) ?></div>
+    <?php if ($flash['success']): ?>
+    <div class="flash-success" role="alert"><?= htmlspecialchars($flash['success']) ?></div>
     <?php endif; ?>
-    <?php if ($flashError): ?>
-    <div class="flash-error" role="alert"><?= htmlspecialchars($flashError) ?></div>
+    <?php if ($flash['error']): ?>
+    <div class="flash-error" role="alert"><?= htmlspecialchars($flash['error']) ?></div>
     <?php endif; ?>
 
     <h2>Pages statiques</h2>
diff --git a/app/templates/partials/form/form-help-block.php b/app/templates/partials/form/form-help-block.php
new file mode 100644
index 0000000..a3be101
--- /dev/null
+++ b/app/templates/partials/form/form-help-block.php
@@ -0,0 +1,26 @@
+<?php
+/**
+ * Renders a single form help block as HTML.
+ *
+ * Variables consumed:
+ *   string $helpContent — raw Markdown string from the DB (may be empty).
+ *
+ * Outputs nothing when $helpContent is empty or whitespace-only.
+ * Parsedown must already be autoloaded (it is, via bootstrap → APP_ROOT/src/).
+ */
+
+$helpContent = trim($helpContent ?? '');
+if ($helpContent === '') {
+    return;
+}
+
+require_once APP_ROOT . '/src/Parsedown.php';
+$pd   = new Parsedown();
+$pd->setSafeMode(true);
+$html = $pd->text($helpContent);
+?>
+<div class="form-help-block">
+    <?= $html ?>
+</div>
+<?php
+unset($helpContent, $pd, $html);