diff --git a/README b/README
index 6fb5d3942e..90079e3c2b 100644
--- a/README
+++ b/README
@@ -152,6 +152,13 @@ The Genode source tree is composed of the following subdirectories:
   This source-code repository contains the device-driver environment for the
   audio drivers of the Open Sound System (OSS).
 
+:'dde_rump':
+
+  This source-code repository contains the port of rump kernels, which are
+  used to execute subsystems of the NetBSD kernel as user level processes.
+  The repository contains a server that uses a rump kernel to provide
+  various NetBSD file systems to Genode.
+
 :'qt4':
 
   This source-code repository contains the Genode version of Qt4 framework.
diff --git a/doc/components.txt b/doc/components.txt
index 39997587ec..ab97dd94ee 100644
--- a/doc/components.txt
+++ b/doc/components.txt
@@ -332,14 +332,26 @@ Separate components:
   A read-only file-system implementation that reads data from a TAR archive,
   which, in turn, is provided by a ROM service.
 
+:'dde_rump/src/server/rump_fs':
+  A file-system server that contains various file-systems ported from the
+  NetBSD kernel.
+
 :'os/src/server/lx_fs':
   A file system server that makes the file system of a Linux base platform
   available to Genode.
 
+:'os/src/server/trace_fs':
+  A pseudo file system that can be used as a front end to core's TRACE
+  service.
+
 :'os/src/server/rom_blk':
   Provides the content of a ROM file as a block session, similar to the
   loop-mount mechanism on Linux
 
+:'os/src/server/ram_blk':
+  Provides the content of a RAM dataspace as a block session. In contrast
+  to 'rom_blk', this server provides a writeable block device.
+
 :'os/src/server/terminal_log':
   Adapter for forwarding LOG messages to a terminal session.