Orthography
All German nouns are capitalised. This applies even to infinitives used as nouns. It should be noted that in German there is a technical distinction, which is not widely known even among native speakers, between Substantive and Nomen. The former are non-comparable nouns to be used with an article, are capitalised, while the latter class, which includes adjectives for example, may not be.
Read more about this topic: German Nouns