Abstract: Methods for enriching metadata associated with a document that is categorized in a document category are described. Documents are pre-categorized within a document category. Uniform resource locaters (URL) that are related to a document category are identified and linked to the document category. Indications of tokens and relationships between the tokens and the URLs are received. The tokens are linked to the URLs. The tokens are propagated to the document categories and to the documents therein based on linking between the token, URL, and document category. As such the document category, and documents therein, are provided with metadata that is descriptive thereof. The documents and their associated metadata tokens are useable to generate a searchable index of the documents. The linking between the tokens, URLs, and categories is also useable to identify tokens that are too specific, too general, or documents that are miscategorized.