# How to write chemical equation with additional information on the arrow?

**URL:** <https://discourse.hypatiasys.com/t/how-to-write-chemical-equation-with-additional-information-on-the-arrow/264>\
**Category:** How to type...?\
**Created:** [December 30, 2024, 5:41pm UTC](https://discourse.hypatiasys.com/t/how-to-write-chemical-equation-with-additional-information-on-the-arrow/264 "2024-12-30T17:41:11Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![admin](https://discourse.hypatiasys.com/letter_avatar_proxy/v4/letter/a/3ec8ea/32.png) [@admin](https://discourse.hypatiasys.com/u/admin)\
**Post date:** [December 30, 2024, 5:41pm UTC](https://discourse.hypatiasys.com/t/how-to-write-chemical-equation-with-additional-information-on-the-arrow/264/1 "2024-12-30T17:41:11Z")

</div>

This can be achieved by combining two math commands:

Start by searching for `dmathop` that allows to place symbols over and under any symbol:

 ![image](https://discourse.hypatiasys.com/uploads/default/original/1X/3341a10708562c1ade677ab3ca86add4273e681c.png)

In the middle square insert the arrow you like, for example, `longrightarrow`:

 ![image](https://discourse.hypatiasys.com/uploads/default/original/1X/2f5f06a1289802af29eb7de2670b3c8e329949c6.png)

Then type the additional information in the top (bottom) square.

Here is a final example:

![image](https://discourse.hypatiasys.com/uploads/default/original/1X/aca9d861884bbbb3baeb0a749ddc32e48de174cc.png)

The unfilled box will disappear once inserting into document.