deletions | additions       diff --git a/bulk upload.md b/bulk upload.md  index dfe1ae1..ff88184 100644  --- a/bulk upload.md  +++ b/bulk upload.md 
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1. For yields uploads, the only required field is a `yield` column.  2. For trait uploads, there must be at least one column whose label exactly matches the variable name for the trait value being specified. (Leading and trailing spaces are permitted, but letter case must exactly match the name of the variable specified in the database.)  ## **Information that may references existing database entries and that _may_  be specified globally for the entire dataset.** 1. Citation  * If only one citation for the entire dataset exists, it may be specified interactively by choosing a citation on the citations page instead of including citation information in the CSV file.  * Otherwise, specify the citation in the CSV table using either (doi) or (author, year, first 20 or more characters of (title)) _[Clarify this. Currently, _[Currently,  the full title must be specified.]_ * If a `citation_doi` is available for all citations in the data set, the citation corresponding to each row may be specified in a `citation_doi` column. In this case, the `citation_author`, `citation_year`, and `citation_title` columns must all be deleted. (Alternatively, the string `-ignore` may be appended to each of these headings. One might want to do this, for example, to keep a visual record of the author, year, and title even when it is the citation doi that is being used to determine how the data will associated with a citation in the database.)  * Conversely, if a `citation_doi` is not available for all citations in the data set, or if it is preferred to specify the citation by author, year, and title, then the `citation_doi` column should be deleted and the `citation_author`, `citation_year`, and `citation_title` must all be entered.   2. Site