# How to update topology file after insert-molecules?

**URL:** <https://gromacs.bioexcel.eu/t/how-to-update-topology-file-after-insert-molecules/2206>\
**Category:** User discussions\
**Created:** [May 23, 2021, 1:30pm UTC](https://gromacs.bioexcel.eu/t/how-to-update-topology-file-after-insert-molecules/2206 "2021-05-23T13:30:10Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![MagnusL](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/magnusl/32/2380_2.png) [@MagnusL](https://gromacs.bioexcel.eu/u/MagnusL)\
**Post date:** [February 29, 2024, 5:12pm UTC](https://gromacs.bioexcel.eu/t/how-to-update-topology-file-after-insert-molecules/2206/9 "2024-02-29T17:12:31Z")

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Just make sure that the order of the interaction definitions are correct.  
I would suggest reading the thread at [Including parameters of a new molecule in gromacs topology files](https://gromacs.bioexcel.eu/t/including-parameters-of-a-new-molecule-in-gromacs-topology-files/8166/1) as well as [https://manual.gromacs.org/documentation/current/reference-manual/topologies/topology-file-formats.html](https://manual.gromacs.org/documentation/current/reference-manual/topologies/topology-file-formats.html) and [GROMACS File Formats: Understanding topology, itp, and gro files - Compchems](https://www.compchems.com/gromacs-file-formats-understanding-topology-itp-and-gro-files/#gro-file-format).

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