ETSI ES 201 873-10 V4.5.1 (2013-04) is an extension for the core TTCN3 language. It is similar to javadoc; comments can be used to include specific information for the purpose of documenting the TTCN-3 source code itself. This should be implemented in Eclipse Titan; if we parse these comments, they could be used for example to display a help tooltip when hovering over a symbol in the code editor.