diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 00000000..1472f871
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,78 @@
+<!--
+Hello there!
+
+Thanks for either
+i. preparing a new package for submission to the community archive or
+ii. improving one or multiple packages.
+
+Both tasks are described in the submission guide here: https://www.poseidon-adna.org/#/archive_submission_guide
+
+You can now open this Pull Request and then work through the relevant checklists below.
+-->
+
+
+
+<!-- TODO: Delete this section if you are not adding a new package, but only modify an existing one. -->
+
+## PR Checklist for a new package submission
+
+### General package properties
+
+- [ ] The package does not exist already in the community archive, also not with a different name.
+- [ ] The package title in the `POSEIDON.yml` conforms to the general title structure suggested here: `<Year>_<Last name of first author>_<Region, time period or special feature of the paper>`, e.g. `2021_Zegarac_SoutheasternEurope`, `2021_SeguinOrlando_BellBeaker` or `2021_Kivisild_MedievalEstonia`.
+- [ ] The package is stored in a directory that is named like the package title.
+
+***
+
+- [ ] The package is complete and features the following elements:
+  - [ ] Genotype data in binary PLINK format (not EIGENSTRAT format).
+  - [ ] A `POSEIDON.yml` file with not just the file-referencing fields, but also the following meta-information fields present and filled: `poseidonVersion`, `title`, `description`, `contributor`, `packageVersion`, `lastModified` (see [here](https://github.com/poseidon-framework/poseidon-schema/blob/master/POSEIDON_yml_fields.tsv) for their definition)
+  - [ ] A reasonably filled `.janno` file (for a list of available fields look [here](https://github.com/poseidon-framework/poseidon-schema/blob/master/janno_columns.tsv) and [here](https://www.poseidon-adna.org/#/janno_details) for more detailed documentation about them).
+  - [ ] A `.bib` file with the necessary literature references for each sample in the `.janno` file.
+- [ ] Every file in the submission is correctly referenced in the `POSEIDON.yml` file and there are no additional, supplementary files in the submission that are not documented there.
+- [ ] Genotype data, `.janno` and `.bib` file are all named after the package title and only differ in the file extension.
+- [ ] All text files are UTF-8 encoded and have Unix/Unix-like line endings (`LF`, not `CR+LF` or `CR`).
+- [ ] The package version in the `POSEIDON.yml` file is `1.0.0`.
+- [ ] The `poseidonVersion` of the package in the `POSEIDON.yml` file is set to the latest version of the Poseidon schema.
+- [ ] The `POSEIDON.yml` file contains the corresponding checksums for the fields `genoFile`, `snpFile`, `indFile`, `jannoFile` and `bibFile`.
+- [ ] There is either no `CHANGELOG` file or one with a single entry for version `1.0.0`.
+
+***
+
+- [ ] The `Publication` column in the `.janno` file is filled and the respective `.bib` file has complete entries for the listed mentioned keys.
+- [ ] The `.janno` file does not include any empty columns or columns only filled with `n/a`.
+- [ ] The order of columns in the `.janno` file adheres to the standard order as defined in the Poseidon schema [here](https://github.com/poseidon-framework/poseidon-schema/blob/master/janno_columns.tsv).
+
+***
+
+- [ ] The package passes a validation with `trident validate --fullGeno`.
+
+***
+
+- [ ] Large genotype data files are properly tracked with Git LFS and not directly pushed to the repository. For an instruction on how to set up Git LFS please look [here](https://www.poseidon-adna.org/#/archive_submission_guide?id=submitting-the-package).
+
+
+
+<!-- TODO: Delete this section if you are not modifying an existing package, but add an entirely new one. -->
+
+## PR Checklist for modifying one or multiple existing packages
+
+- [ ] The changes maintain the structural integrity of the affected packages.
+- [ ] The checksums of the modified files in the respective `POSEIDON.yml` files were adjusted properly.
+- [ ] Every file in the submission is correctly referenced in the relevant `POSEIDON.yml` files and there are no additional, supplementary files in the submission that are not documented there.
+- [ ] All text files are still UTF-8 encoded and have Unix/Unix-like line endings (`LF`, not `CR+LF` or `CR`).
+
+***
+
+- [ ] The `packageVersion` numbers of the affected packages were increased in their `POSEIDON.yml` files.
+- [ ] The changes were documented in the respective `CHANGELOG` files. If no `CHANGELOG` files existed previously it was added here.
+- [ ] The `lastModified` fields of the affected `POSEIDON.yml` files were updated.
+- [ ] The `contributor` fields were updated with `name`, `email` and `orcid` of the relevant, new contributors.
+
+***
+
+- [ ] All affected packages pass a validation with `trident validate --fullGeno`.
+
+***
+
+- [ ] Large genotype data files are properly tracked with Git LFS and not directly pushed to the repository. For an instruction on how to set up Git LFS please look [here](https://www.poseidon-adna.org/#/archive_submission_guide?id=submitting-the-package).
diff --git a/.github/workflows/validation.yml b/.github/workflows/validation.yml
index dba9d798..564a1244 100644
--- a/.github/workflows/validation.yml
+++ b/.github/workflows/validation.yml
@@ -29,3 +29,7 @@ jobs:
       run: ./checkForDisplacedFiles.sh
       working-directory: ./data
 
+    - name: Check if all registered files are actually LFS pointers
+      run: git lfs fsck --pointers
+      working-directory: ./data
+