diff --git a/docs/clmc-service.md b/docs/clmc-service.md
new file mode 100644
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+<!--
+// © University of Southampton IT Innovation Centre, 2018
+//
+// Copyright in this software belongs to University of Southampton
+// IT Innovation Centre of Gamma House, Enterprise Road, 
+// Chilworth Science Park, Southampton, SO16 7NS, UK.
+//
+// This software may not be used, sold, licensed, transferred, copied
+// or reproduced in whole or in part in any manner or form or in or
+// on any media by any person other than in accordance with the terms
+// of the Licence Agreement supplied with the software, or otherwise
+// without the prior written consent of the copyright owners.
+//
+// This software is distributed WITHOUT ANY WARRANTY, without even the
+// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+// PURPOSE, except where stated in the Licence Agreement supplied with
+// the software.
+//
+//      Created By :            Nikolay Stanchev
+//      Created Date :          02-05-2018
+//      Created for Project :   FLAME
+-->
+
+# **Flame CLMC API Service**
+
+#### **Authors**
+
+|Authors|Organisation|                    
+|---|---|  
+|[Nikolay Stanchev](mailto:ns17@it-innovation.soton.ac.uk)|[University of Southampton, IT Innovation Centre](http://www.it-innovation.soton.ac.uk)|
+
+#### Description
+
+This document describes the CLMC service and its API endpoints. The CLMC service is implemented in the *Python* framework called **Pyramid**.
+It offers different API endpoints to configure and control the aggregator, which is an essential part in the process of measuring the end-to-end performance.
diff --git a/src/clmc-webservice/clmcservice/utilities.py b/src/clmc-webservice/clmcservice/utilities.py
index ddb8dd935c29fd628dc57c94f7f7e3601e11d029..7f7fa7522f6cf7c30a4dd2ba3326210bfd539b04 100644
--- a/src/clmc-webservice/clmcservice/utilities.py
+++ b/src/clmc-webservice/clmcservice/utilities.py
@@ -72,7 +72,7 @@ def validate_config_content(configuration):
 
     assert configuration.get('aggregator_report_period') > 0, "Report period must be a positive integer, received {0} instead.".format(configuration.get('aggregator_report_period'))
 
-    assert URL_REGEX.match(configuration.get('aggregator_database_url')) is not None, "The aggregator must have a valid database URL in its configuration, received {0} instead.".format(configuration.get('aggregator_report_period'))
+    assert URL_REGEX.match(configuration.get('aggregator_database_url')) is not None, "The aggregator must have a valid database URL in its configuration, received {0} instead.".format(configuration.get('aggregator_database_url'))
 
     return configuration