Google Docs now lets you add line numbers to documents With this feature, Google can automatically assign numbers to each line, which you can then configure to span an entire document, page, or section.
Line numbers are often used by legal professionals to make it easier to point to specific parts of a document. To enable line numbers in Documents, make sure your document is set to paginated mode by going to File > Page Setup and choosing Pages. You can then go to Tools > Line Numbers > Show Line Numbers to add numbered lines. Google says the numbers will also appear on printed documents.