Extended the README file

README

@@ -7,8 +7,8 @@ Prerequisits
 2) In order to use the WSDL API you need to download and install the SUDS python package
 	Download suds-0.4.tar.gz here: https://pypi.python.org/pypi/suds
 	Install via command line: $ sudo pip install suds-0.4.tar.gz
-3) If you don't want to execute the scripts from within an IDE (e.g. Pycharm) you could install pythoninstaller 
-   to build the tools: $ sudo pip install pyinstaller
+3) If you don't want to execute the scripts from within an IDE (e.g. Pycharm) you could install 
+   pythoninstaller to build the tools: $ sudo pip install pyinstaller
 
 Building the tools
 ------------------
@@ -22,7 +22,19 @@ Running the tools
 
 e.g.: webctrl$ ./dist/wc_query/wc_query
 
-When you run the tools without any arguments you will be prompted with how to use the commands and which
-arguments to pass.
+When you run the tools without any arguments you will be prompted with how to use the commands and
+which arguments to pass.
+
+Short explanation of each tool
+------------------------------
+
+wc_query : Query the paths and devices starting from /trees/geographic
+
+wc_report : Retrieve a report for a directory or a specific device
+
+wc_getValue : Retrieve the current value of a device
+
+wc_getTrend : Retrieve data and date for a given time period and device 
+(ATTENTION: this command does not yet work because the path to the trend data is not correct)