`#+...` is called "affiliated keyword" in the spec[1]. Those are distinct from comments, which are required to have a whitespace character after the hash sign[2

`#+...` is called "affiliated keyword" in the spec[1]. Those are distinct from comments, which are required to have a whitespace character after the hash sign[2]. [1]: http://orgmode.org/worg/dev/org-syntax.html#Affiliated_keywords http://orgmode.org/worg/dev/org-syntax.html#Affiliated_keywo... [2]: http://orgmode.org/worg/dev/org-syntax.html#Comments http://orgmode.org/worg/dev/org-syntax.html#Comments