1. A method in a computing system with a processor for augmenting a corpus of documents, the method comprising: generating a corpus concept graph from the documents indicating connections between concepts of the documents of the corpus; analyzing the corpus concept graph to determine whether connectedness of concepts of the documents of the corpus is sufficient; and when the analysis indicates that the connectedness of some concepts is not sufficient, adding to the corpus documents relating to the concepts that do not have sufficient connectedness wherein the generating, analyzing, and adding are performed by the processor.