Editing / writing my own LoR

[maybethisyear]

I've found myself in a position where I have the opportunity to essentially write my own LoR. My recommender is someone who does not speak/write English as his primary language. He reads and understand it well enough, though. He has provided me with his 'skeleton' version riddled with grammatical errors for me to edit. It's just over a page in length, but I'd like to get it closer to two pages and provide some more details. He's someone I work with and get along with really well, and I'm sure he won't mind at all (I've edited/improved recommendations he's written for other people before.)

 

I guess my question is how do I proceed? Any not-so-obvious pitfalls I should avoid?

[Gvh]

I used this website when writing my LORs; I found it super helpful!

 

http://theprofessorisin.com/2012/09/07/how-to-write-a-recommendation-letter/ 

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For clarification, are you thinking about making changes without showing him the final letter? IMO, that's a big mistake.