diff --git a/backend/indexer.py b/backend/indexer.py
index 28c2030..e600b21 100644
--- a/backend/indexer.py
+++ b/backend/indexer.py
@@ -426,6 +426,80 @@ async def reload_index() -> Dict[str, Any]:
     return stats
 
 
+async def reload_single_vault(vault_name: str) -> Dict[str, Any]:
+    """Force a re-index of a single vault and return its statistics.
+    
+    Args:
+        vault_name: Name of the vault to reindex.
+        
+    Returns:
+        Dict with vault statistics (file_count, tag_count).
+        
+    Raises:
+        ValueError: If vault_name is not found in configuration.
+    """
+    global vault_config
+    
+    # Reload vault config from env vars
+    vault_config.update(load_vault_config())
+    
+    # Merge with saved settings
+    from backend.vault_settings import get_vault_setting
+    saved_settings = get_vault_setting(vault_name)
+    
+    if vault_name not in vault_config:
+        raise ValueError(f"Vault '{vault_name}' not found in configuration")
+    
+    config = vault_config[vault_name]
+    
+    # Override with saved settings if present
+    if saved_settings:
+        if "includeHidden" in saved_settings:
+            config["includeHidden"] = saved_settings["includeHidden"]
+        if "hiddenWhitelist" in saved_settings:
+            config["hiddenWhitelist"] = saved_settings["hiddenWhitelist"]
+    
+    # Remove old vault data from index structures
+    await remove_vault_from_index(vault_name)
+    
+    # Re-add the vault with updated configuration
+    vault_path = config["path"]
+    loop = asyncio.get_event_loop()
+    vault_data = await loop.run_in_executor(None, _scan_vault, vault_name, vault_path, config)
+    vault_data["config"] = config
+    
+    # Build lookup entries for the vault
+    new_lookup_entries: Dict[str, List[Dict[str, str]]] = {}
+    for f in vault_data["files"]:
+        entry = {"vault": vault_name, "path": f["path"]}
+        fname = f["path"].rsplit("/", 1)[-1].lower()
+        fpath_lower = f["path"].lower()
+        for key in (fname, fpath_lower):
+            if key not in new_lookup_entries:
+                new_lookup_entries[key] = []
+            new_lookup_entries[key].append(entry)
+    
+    async_lock = _get_async_lock()
+    async with async_lock:
+        with _index_lock:
+            index[vault_name] = vault_data
+            for key, entries in new_lookup_entries.items():
+                if key not in _file_lookup:
+                    _file_lookup[key] = []
+                _file_lookup[key].extend(entries)
+            path_index[vault_name] = vault_data.get("paths", [])
+            global _index_generation
+            _index_generation += 1
+    
+    # Rebuild attachment index for this vault only
+    from backend.attachment_indexer import build_attachment_index
+    await build_attachment_index({vault_name: config})
+    
+    stats = {"file_count": len(vault_data["files"]), "tag_count": len(vault_data["tags"])}
+    logger.info(f"Vault '{vault_name}' reindexed: {stats['file_count']} files, {stats['tag_count']} tags")
+    return stats
+
+
 def get_vault_names() -> List[str]:
     """Return the list of all indexed vault names."""
     return list(index.keys())
diff --git a/backend/main.py b/backend/main.py
index c68982c..904f1e5 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -1198,6 +1198,28 @@ async def api_reload(current_user=Depends(require_admin)):
     return {"status": "ok", "vaults": stats}
 
 
+@app.get("/api/index/reload/{vault_name}")
+async def api_reload_vault(vault_name: str, current_user=Depends(require_admin)):
+    """Force a re-index of a single vault.
+    
+    Args:
+        vault_name: Name of the vault to reindex.
+        
+    Returns:
+        Dict with vault statistics.
+    """
+    try:
+        from backend.indexer import reload_single_vault
+        stats = await reload_single_vault(vault_name)
+        await sse_manager.broadcast("vault_reloaded", {
+            "vault": vault_name,
+            "stats": stats,
+        })
+        return {"status": "ok", "vault": vault_name, "stats": stats}
+    except ValueError as e:
+        raise HTTPException(status_code=404, detail=str(e))
+
+
 # ---------------------------------------------------------------------------
 # SSE endpoint — Server-Sent Events stream
 # ---------------------------------------------------------------------------
diff --git a/backend/utils.py b/backend/utils.py
index 18268bc..ab20833 100644
--- a/backend/utils.py
+++ b/backend/utils.py
@@ -5,6 +5,12 @@ from typing import Dict, Any, Tuple
 def should_include_path(rel_parts: Tuple[str, ...], vault_config: Dict[str, Any]) -> bool:
     """Check if a path should be included based on hidden files configuration.
     
+    Simplified logic:
+    - If includeHidden=True: include ALL hidden files/folders recursively
+    - If includeHidden=False: check whitelist
+      - If a whitelisted folder is in the path, include ALL sub-hidden files/folders
+      - Otherwise, exclude the path
+    
     Args:
         rel_parts: Tuple of path parts relative to vault root
         vault_config: Vault configuration dict with includeHidden and hiddenWhitelist
@@ -23,14 +29,14 @@ def should_include_path(rel_parts: Tuple[str, ...], vault_config: Dict[str, Any]
         return True
     
     if include_hidden:
-        # Include all hidden files/folders
+        # Include all hidden files/folders recursively
         return True
     
-    # Check if ALL hidden parts are in the whitelist
-    # If any hidden part is NOT in the whitelist, exclude the path
-    for hidden_part in hidden_parts:
-        if hidden_part not in hidden_whitelist:
-            return False
+    # Check if the FIRST hidden part is in the whitelist
+    # If yes, include all sub-hidden files/folders automatically
+    first_hidden = hidden_parts[0]
+    if first_hidden in hidden_whitelist:
+        return True
     
-    # All hidden parts are in the whitelist
-    return True
+    # First hidden part not in whitelist, exclude
+    return False
diff --git a/frontend/app.js b/frontend/app.js
index d8bd85d..b17992a 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -3231,6 +3231,9 @@
 
   // --- Hidden Files Configuration ---
   
+  // Track which vaults have been modified
+  let modifiedVaults = new Set();
+  
   async function loadHiddenFilesSettings() {
     const container = document.getElementById("hidden-files-vault-list");
     if (!container) return;
@@ -3290,7 +3293,7 @@
         document.createTextNode("Liste blanche")
       ]);
       const whitelistHint = el("span", { class: "config-hint", style: "display:block;margin-bottom:8px" }, [
-        document.createTextNode("Dossiers cachés spécifiques à afficher (ex: .obsidian, .github)")
+        document.createTextNode("Dossiers cachés spécifiques à afficher (tous les sous-dossiers cachés seront inclus)")
       ]);
       
       const whitelistItems = el("div", { class: "hidden-files-whitelist-items", id: `whitelist-items-${vault.name}` });
@@ -3330,10 +3333,20 @@
       // Event listeners
       const addBtn = addRow.querySelector("button");
       const input = addRow.querySelector("input");
+      const checkbox = toggleRow.querySelector("input[type='checkbox']");
       
-      addBtn.addEventListener("click", () => addWhitelistItem(vault.name));
+      addBtn.addEventListener("click", () => {
+        addWhitelistItem(vault.name);
+        modifiedVaults.add(vault.name);
+      });
       input.addEventListener("keypress", (e) => {
-        if (e.key === "Enter") addWhitelistItem(vault.name);
+        if (e.key === "Enter") {
+          addWhitelistItem(vault.name);
+          modifiedVaults.add(vault.name);
+        }
+      });
+      checkbox.addEventListener("change", () => {
+        modifiedVaults.add(vault.name);
       });
     });
   }
@@ -3353,6 +3366,7 @@
     const removeBtn = item.querySelector("button");
     removeBtn.addEventListener("click", () => {
       item.remove();
+      modifiedVaults.add(vaultName);
     });
     
     return item;
@@ -3361,6 +3375,7 @@
   function addWhitelistItem(vaultName) {
     const input = document.getElementById(`whitelist-input-${vaultName}`);
     const container = document.getElementById(`whitelist-items-${vaultName}`);
+    const includeHiddenCheckbox = document.getElementById(`hidden-include-${vaultName}`);
     
     if (!input || !container) return;
     
@@ -3378,6 +3393,11 @@
       return;
     }
     
+    // Auto-uncheck "Afficher tous les fichiers cachés" when adding to whitelist
+    if (includeHiddenCheckbox && includeHiddenCheckbox.checked) {
+      includeHiddenCheckbox.checked = false;
+    }
+    
     const item = createWhitelistItem(vaultName, normalizedValue);
     container.appendChild(item);
     input.value = "";
@@ -3414,6 +3434,7 @@
       });
       
       await Promise.all(promises);
+      modifiedVaults.clear();
       showToast("✓ Paramètres sauvegardés", "success");
     } catch (err) {
       console.error("Failed to save hidden files settings:", err);
@@ -3434,9 +3455,18 @@
       // Update button text to show reindexing phase
       if (btn) { btn.textContent = "⏳ Réindexation..."; }
       
-      // Then trigger reindex with saved settings
-      await api("/api/index/reload");
-      showToast("✓ Réindexation terminée", "success");
+      // Reindex only modified vaults if any, otherwise reindex all
+      if (modifiedVaults.size > 0) {
+        const vaultsToReindex = Array.from(modifiedVaults);
+        for (const vaultName of vaultsToReindex) {
+          await api(`/api/index/reload/${encodeURIComponent(vaultName)}`);
+        }
+        showToast(`✓ Réindexation terminée (${vaultsToReindex.length} vault${vaultsToReindex.length > 1 ? 's' : ''})`, "success");
+      } else {
+        await api("/api/index/reload");
+        showToast("✓ Réindexation terminée", "success");
+      }
+      
       loadDiagnostics();
       await Promise.all([loadVaults(), loadTags()]);
     } catch (err) {