diff --git a/krusader/Panel/listpanel.cpp b/krusader/Panel/listpanel.cpp
--- a/krusader/Panel/listpanel.cpp
+++ b/krusader/Panel/listpanel.cpp
@@ -1029,6 +1029,8 @@
 void ListPanel::panelInactive()
 {
     // don't refresh when not active (ie: hidden, application isn't focused ...)
+    // TODO disabled so that the user sees changes in non-focused window; if the performance impact
+    // is too high we need another solution here
     //func->files()->vfs_enableRefresh(false);
 }
 
diff --git a/krusader/Panel/panelfunc.cpp b/krusader/Panel/panelfunc.cpp
--- a/krusader/Panel/panelfunc.cpp
+++ b/krusader/Panel/panelfunc.cpp
@@ -703,6 +703,7 @@
     } // for
 }
 
+// TODO it is not possible to move virtual local files to trash
 void ListPanelFunc::deleteFiles(bool reallyDelete)
 {
     // first get the selected file names list
diff --git a/krusader/VFS/vfile.cpp b/krusader/VFS/vfile.cpp
--- a/krusader/VFS/vfile.cpp
+++ b/krusader/VFS/vfile.cpp
@@ -42,6 +42,8 @@
 
 bool vfile::vfile_userDefinedFolderIcons = true;
 
+// TODO set default vfile_size to '-1' to distinguish between empty directories and directories with
+// unknown size
 
 vfile::vfile(const QString& name,                   // useful construtor
              const KIO::filesize_t size,
diff --git a/krusader/VFS/vfs.h b/krusader/VFS/vfs.h
--- a/krusader/VFS/vfs.h
+++ b/krusader/VFS/vfs.h
@@ -117,6 +117,7 @@
     /// Return a list of vfiles for a search query. Or an empty list if nothing was found.
     QList<vfile *> searchVfiles(const KRQuery &filter);
     /// The total size of all files in the current directory (only valid after refresh).
+    // TODO unused
     KIO::filesize_t vfs_totalSize();
     /// Return the VFS type.
     inline VFS_TYPE type() { return _type; }
@@ -151,6 +152,7 @@
 public slots:
     /// Re-read the current directory files or change to another directory. Blocking.
     /// If the directory was read true is returned else false.
+    // optional TODO: add an async version of this
     bool refresh(const QUrl &directory = QUrl());
     /// Notify this VFS that the current directory content may have changed.
     void mayRefresh();
diff --git a/krusader/VFS/vfs.cpp b/krusader/VFS/vfs.cpp
--- a/krusader/VFS/vfs.cpp
+++ b/krusader/VFS/vfs.cpp
@@ -115,6 +115,7 @@
     return adjustedUrl;
 }
 
+// TODO (re-)implement incremental refresh
 bool vfs::refresh(const QUrl &directory)
 {
 
@@ -226,10 +227,10 @@
     }
 }
 
+// TODO called from another thread, creating KIO jobs does not work here
 void vfs::calcSpaceKIO(const QUrl &url, KIO::filesize_t *totalSize, unsigned long *totalFiles,
                        unsigned long *totalDirs, bool *stop)
 {
-    // TODO does not work
     return;
 
     if (stop && *stop)
diff --git a/krusader/VFS/virt_vfs.cpp b/krusader/VFS/virt_vfs.cpp
--- a/krusader/VFS/virt_vfs.cpp
+++ b/krusader/VFS/virt_vfs.cpp
@@ -348,6 +348,7 @@
     }
 
     if (!_fileEntry.contains(KIO::UDSEntry::UDS_MODIFICATION_TIME)) {
+        // TODO this also happens for FTP directories
         return 0; // file not found
     }