diff --git a/php-toolkit/.gitrepo b/php-toolkit/.gitrepo
index 088e5e8b..18ba6cf5 100644
--- a/php-toolkit/.gitrepo
+++ b/php-toolkit/.gitrepo
@@ -6,7 +6,7 @@
 [subrepo]
 	remote = git@github.com:rotdrop/nextcloud-app-toolkit.git
 	branch = main
-	commit = 98e671c3278ef9839bcf4a0de403b282c27c0106
-	parent = cb7707ffe6e64cb88af896bba0e59efb16d2c772
+	commit = de7d16207af2905246c67f59935725697ced3f19
+	parent = 168fd766b8b528ff80a7db370bf936a8e8d7463f
 	method = merge
 	cmdver = 0.4.5
diff --git a/php-toolkit/README.md b/php-toolkit/README.md
index ed91f124..b786c2c0 100644
--- a/php-toolkit/README.md
+++ b/php-toolkit/README.md
@@ -1,5 +1,16 @@
 # nextcloud-app-toolkit
 
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
+**Table of Contents**
+
+    - [Description](#description)
+    - [Setup](#setup)
+        - [Direct Use as GIT Sub-Repo](#direct-use-as-git-sub-repo)
+        - [Indirect "Scoped" Use](#indirect-scoped-use)
+    - [Why](#why)
+
+<!-- markdown-toc end -->
+
 ## Description
 
 Some common PHP classes for my Nextcloud apps. The Idea is to use `git
@@ -10,6 +21,8 @@ project.
 
 ## Setup
 
+### Direct Use as GIT Sub-Repo
+
 Say we choose `lib/Toolkit/` as destination folder, then one could do
 ```
 git subrepo clone THIS_REPOS_URL lib/Toolkit
@@ -28,6 +41,30 @@ Then one needs to add an auto-loading directive to the project's `composer.json`
 This will instruct the `composer` to generate appropriate auto-loading
 files such that the classes can be found.
 
+### Indirect "Scoped" Use
+
+When using this toolkit in more than one app then the usual
+compatibility problems occur when using the code
+[directly](#direct-use-as-git-sub-repo) as described above. Different
+apps may depend on different versions but only one shared instance of
+the package is used. To work around this it is possible to wrap the
+entire package into a namespace. This is done by simple exchanging the
+`Rotdrop` PHP namespace by another one. When using `make` for the
+build process in an app this can be done with the following `Makefile`
+snippet:
+
+``` makefile
+APP_TOOLKIT_DIR = $(ABSSRCDIR)/php-toolkit
+APP_TOOLKIT_DEST = $(ABSSRCDIR)/lib/Toolkit
+APP_TOOLKIT_NS = CAFEVDB
+
+include $(APP_TOOLKIT_DIR)/tools/scopeme.mk
+```
+
+Here `ABSSRCDIR` is assumed to contain the absolute path to the
+consuming package and `php-toolkit` is a folder which contains the
+sources of this package.
+
 ## Why
 
 One could have created a vanilla composer package. However, that has
diff --git a/php-toolkit/Traits/UserRootFolderTrait.php b/php-toolkit/Traits/UserRootFolderTrait.php
index 82a1778e..c0c466ed 100644
--- a/php-toolkit/Traits/UserRootFolderTrait.php
+++ b/php-toolkit/Traits/UserRootFolderTrait.php
@@ -111,7 +111,9 @@ public function getUserFolderPath():string
    * path then it must be relative to the user folder.
    *
    * @param null|callable $callback The callback receives two arguments, the
-   * current file system node and the recursion depth.
+   * current file system node and the recursion depth. If the current node is
+   * a folder then the callback is invoked before traversing its directory
+   * entries.
    *
    * @param int $depth Internal recursion depth parameters. The $callback
    * receives it as second argument.
@@ -132,7 +134,9 @@ public function folderWalk(mixed $pathOrFolder, ?callable $callback = null, int
     }
 
     if (!empty($callback)) {
-      $callback($folder, $depth);
+      if ($callback($folder, $depth) === false) {
+        return 0;
+      }
     }
     ++$depth;