diff --git a/README.md b/README.md
index bd5e8f2..798e327 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# KaraDAV - A lightweight WebDAV server, with NextCloud compatibility
+# KaraDAV - A lightweight WebDAV server, compatible with ownCloud and NextCloud clients
 
 This is a simple and lighweight WebDAV server, allowing to easily set up a file sharing server compatible with WebDAV and NextCloud clients. It has no dependencies and good performance.
 
@@ -72,7 +72,7 @@ It has been tested with:
 
 **We recommend the ownCloud apps**, as they are more stable and lighter :)
 
-Note that even though it has been tested with NC/OC clients, KaraDAV might stop working at any time with these clients.
+Note that even though it has been tested with NC/OC clients, KaraDAV might stop working at any time with these clients if their publishers decide so.
 
 ## WebDAV clients compatibility
 
@@ -86,7 +86,7 @@ Here is a list of clients tested with KaraDAV:
 * CyberDuck (Windows) version 8.5.0
 * Dolphin (KDE)
 * Thunar (GTK/GNOME)
-* [rclone](https://rclone.org/webdav/) on Linux
+* [rclone](https://rclone.org/webdav/) on Linux, including [bi-directional sync](https://rclone.org/bisync/).
 * [csync](https://csync.org/) on Linux. This is a library offering two-way sync, it is used by the ownCloud client, but it has a command-line client. Just replace `http` with `owncloud`, and `https` with `ownclouds` in URL, eg. `csync /home/bohwaz/sync ownclouds://karadav.example/files/bohwaz/`
 
 ### Android
diff --git a/lib/KaraDAV/Storage.php b/lib/KaraDAV/Storage.php
index 9f88db6..f1fa57e 100644
--- a/lib/KaraDAV/Storage.php
+++ b/lib/KaraDAV/Storage.php
@@ -138,12 +138,15 @@ class Storage extends AbstractStorage
 			case 'DAV::creationdate':
 				return new \DateTime('@' . filectime($target));
 			case WebDAV::PROP_DIGEST_MD5:
-				if (!is_file($target)) {
+				if (!is_file($target) || is_dir($target) || !is_readable($target)) {
 					return null;
 				}
 
 				return md5_file($target);
 			// NextCloud stuff
+			case NextCloud::PROP_OC_CHECKSUMS:
+				// We are not returning OC checksums as this could slow directory listings
+				return null;
 			case NextCloud::PROP_NC_HAS_PREVIEW:
 			case NextCloud::PROP_NC_IS_ENCRYPTED:
 				return 'false';
@@ -238,7 +241,7 @@ class Storage extends AbstractStorage
 		return $out;
 	}
 
-	public function put(string $uri, $pointer, ?string $hash, ?int $mtime): bool
+	public function put(string $uri, $pointer, ?string $hash_algo, ?string $hash, ?int $mtime): bool
 	{
 		if (preg_match(self::PUT_IGNORE_PATTERN, basename($uri))) {
 			return false;
@@ -297,10 +300,14 @@ class Storage extends AbstractStorage
 			@unlink($tmp_file);
 			throw new WebDAV_Exception('Your quota is exhausted', 403);
 		}
-		elseif ($hash && md5_file($tmp_file) != $hash) {
+		elseif ($hash && $hash_algo == 'MD5' && md5_file($tmp_file) != $hash) {
 			@unlink($tmp_file);
 			throw new WebDAV_Exception('The data sent does not match the supplied MD5 hash', 400);
 		}
+		elseif ($hash && $hash_algo == 'SHA1' && sha1_file($tmp_file) != $hash) {
+			@unlink($tmp_file);
+			throw new WebDAV_Exception('The data sent does not match the supplied SHA1 hash', 400);
+		}
 		else {
 			rename($tmp_file, $target);
 		}