Say it like this
- LMK if you have any questions.
- LMK what you think.
- LMK by Thursday so I can book the room.
Use it at work
Inviting questions
- LMK if you have questions.
- LMK if anything's unclear.
Asking for feedback
- LMK what you think.
- LMK if you'd change anything.
Adding a deadline
- LMK by Thursday.
- Can you LMK by EOD?
Don't say this
"Me" is already in LMK.
Don't mix it up
| Term | What it is | Who writes or uses it | When |
|---|---|---|---|
| LMK | tell me (one answer) | chat | questions, feedback |
| keep me posted | send updates over time | everyone | ongoing work |
| FYI | no reply needed | everyone | sharing information |
Practice
Try it
4 quick exercises
1. You shared a document and want feedback. Which is the most natural Slack message?
2. I've pushed the fix. _______ if you still see the error.
3. Which message uses LMK correctly?
4. Rewrite this client email line in a more formal way: 'LMK if u have Qs.'
Say it out loud
Phrase 1 of 3
"LMK if you have any questions."
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More about LMK
Real examples(3)
- in Slack
"Shared the draft in the doc. LMK if anything looks off."
- offering help
"I've used that library before, LMK if you get stuck."
- asking for a decision
"Can you LMK by EOD whether we're going with option A or B?"
More mistakes(2)
Handle with care. LMK is casual. Use "Please let me know" with clients, senior leaders or in formal email.
- ✕LMK. (when you need an answer by noon)✓LMK by noon, please, so I can send it to the client.
LMK has no deadline. Add one if timing matters.
- ✕LMK (in an email to a new client)✓Please let me know if you have any questions.
LMK is casual chat shorthand. Write it out for clients.
Other forms(2)
- let me know full form
"Let me know if you need anything."
- LMK if / what / when with if/what/when
"LMK when you're free."
Often used with(3)
- LMK if · offer help or invite questions
- LMK what you think · ask for feedback
- LMK by · add a deadline
Similar words(3)
- let me know · neutral, works everywhere
- keep me posted · ask for updates over time
- shout if · very casual, UK
Opposites(2)
- no reply needed
- FYI only
Questions(4)
- What is the full form of LMK?
- LMK stands for "let me know".
- Is LMK rude?
- No. It is friendly and casual. Just write "let me know" in formal email.
- How do I add a deadline to LMK?
- Add "by" and a time: "LMK by Friday".
- What is the difference between LMK and keep me posted?
- LMK asks for one answer. Keep me posted asks for updates over time.
