Print documents, if they are formatted correctly (e.g. double-spaced with good sized margins), they can be fairly easily annotated. There are a variety of ways to annotate digital print documents. Word processing tools like Microsoft Word and Google Docs have "comment" features that allow others to insert comments.
How you do it:
In both Microsoft Word and Google Docs you can chose Insert > Comments. Make sure your cursor is near the word/sentence you want to comment on.
Tips and Suggestions:
- When using Microsoft Word, make sure you save your Word document in a format that is compatible with most versions of Word
- When using Google Docs, make sure to choose a color for your comments that is different then the comments of others.