diff --git a/README.md b/README.md
index 12c0d8941..70d9e03c3 100644
--- a/README.md
+++ b/README.md
@@ -6,9 +6,9 @@ This is S2SS, a gateway to forward and process simulation data between real time
 
 ## Documentation
 
-The docuementation for this software is available at [doc/Mainpage](doc/Mainpage.md).
+The documentation for this software is available at [doc/Mainpage](doc/Mainpage.md).
 
-You can access the prebuild documentation at: http://s2ss.0l.de (User: `s2ss`, Pass: `Nie4di5e`).
+You can access the prebuild documentation at: http://s2ss:Nie4di5e@s2ss.0l.de (User: `s2ss`, Pass: `Nie4di5e`).
 Alternatively, you can build the documentation yourself by calling `doxygen` in this directory.
 
 ## Contact
diff --git a/doc/Development.md b/doc/Development.md
new file mode 100644
index 000000000..c91ecd5d9
--- /dev/null
+++ b/doc/Development.md
@@ -0,0 +1,36 @@
+# Development
+
+Developement is currently coordinated by Steffen Vogel <stvogel@eonerc.rwth-aachen.de> using [GitHub](http://github.com/RWTH-ACS/S2SS).
+Please feel free to submit pull requests or bug reports.
+
+## Extensibilty
+
+There are two main places where S2SS can easily extended:
+
+#### New node-type
+
+    REGISTER_NODE_TYPE(struct node_type *vt)
+
+#### New hook functions
+
+    /** The type of a hook defines when a hook will be exectuted. This is used as a bitmask. */
+    enum hook_type {
+    	HOOK_PATH_START		= 1 << 0, /**< Called whenever a path is started; before threads are created. */
+	
+	[...]
+	
+    	HOOK_ASYNC		= 1 << 6, /**< Called asynchronously with fixed rate (see path::rate). */
+	
+    	HOOK_PERIODIC		= 1 << 7, /**< Called periodically. Period is set by global 'stats' option in the configuration file. */
+	
+    	/** @{ Classes of hooks */
+    	/** Internal hooks are mandatory. */
+    	HOOK_INTERNAL		= 1 << 16,
+    	/** All hooks */
+    	HOOK_ALL		= HOOK_INTERNAL - 1
+    	/** @} */
+    };
+    
+    typedef int (*hook_cb_t)(struct path *p, struct hook *h, int when);
+    
+    REGISTER_HOOK(char *name, int priority, hook_cb_t cb, enum hook_type when)
diff --git a/doc/Install.md b/doc/Install.md
index 74bb89f4c..f94db3baf 100644
--- a/doc/Install.md
+++ b/doc/Install.md
@@ -29,7 +29,7 @@ Checkout the `Makefile` and `include/config.h` for some options which have to be
 
 Afterwards, start the compilation with:
 
-	$ make
+    $ make
 
 Append `V=5` to `make` for a more verbose debugging output.
 Append `DEBUG=1` to `make` to add debug symbols.
@@ -38,7 +38,7 @@ Append `DEBUG=1` to `make` to add debug symbols.
 
 Install the files to your search path:
 
-	$ make install
+    $ make install
 
 Append `PREFIX=/opt/local` to change the installation destination.
 
@@ -46,6 +46,6 @@ Append `PREFIX=/opt/local` to change the installation destination.
 
 Verify everything is working and required node-types are compiled-in:
 
-	$ s2ss server
+    $ s2ss server
 
 Will show you the current version of the server including a list of all supported node-types.
diff --git a/doc/Tools.md b/doc/Tools.md
index 3751e0d6f..4d534cbd1 100644
--- a/doc/Tools.md
+++ b/doc/Tools.md
@@ -31,11 +31,14 @@ The `pipe` subcommand allows to read and write samples to `stdin` / `stdout`.
 The `signal` subcommand is a signal generator which writes samples to `stdout`.
 This command can be combined with the `pipe` subcommand.
 
-    Usage: s2ss-signal SIGNAL VALUES RATE [LIMIT]
-      SIGNAL is on of: mixed random sine triangle square
-      VALUES is the number of values a message contains
-      RATE   how many messages per second
-      LIMIT  only send LIMIT messages
+    Usage: s2ss-signal SIGNAL [OPTIONS]
+      SIGNAL   is on of: 'mixed', 'random', 'sine', 'triangle', 'square', 'ramp'
+      -v NUM   specifies how many values a message should contain
+      -r HZ    how many messages per second
+      -f HZ    the frequency of the signal
+      -a FLT   the amplitude
+      -d FLT   the standard deviation for 'random' signals
+      -l NUM   only send LIMIT messages and stop
 
 ### `s2ss test`