diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index dc9368190c43f6820a01bb5c76680d7a3aaf6a6d..bf1254715d67626b6d7bd44bf486d99855782ced 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,4 +1,6 @@
-We welcome contributions from volunteers. A number of [improvements we'd like to see implemented](https://github.com/tlaplus/tlaplus/blob/master/general/docs/contributions.md) are listed at [general/docs/contributions.md](https://github.com/tlaplus/tlaplus/blob/master/general/docs/contributions.md) in addition to the [issues tagged with "helpwanted"](https://github.com/tlaplus/tlaplus/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22). But we're happy to consider anything you'd like to contribute. However, some parts of the tlaplus repository follow a very strict contribution policy. So before you start working on anything, please [discuss with us](https://github.com/tlaplus/tlaplus/issues) what you want to do. You can do that on the [issues page](https://github.com/tlaplus/tlaplus/issues). We do not want to reject your 1k LOC patch because the actual change is not considered sensible by us.
+Is this your first contribution to Open Source? If yes, please read the excellent first time contributor guide at [https://opensource.guide/how-to-contribute/](https://opensource.guide/how-to-contribute/).
+
+Generally, we welcome contributions from volunteers. A number of [improvements we'd like to see implemented](https://github.com/tlaplus/tlaplus/blob/master/general/docs/contributions.md) are listed at [general/docs/contributions.md](https://github.com/tlaplus/tlaplus/blob/master/general/docs/contributions.md) in addition to the [issues tagged with "helpwanted"](https://github.com/tlaplus/tlaplus/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22). But we're happy to consider anything you'd like to contribute. However, some parts of the tlaplus repository follow a very strict contribution policy. So before you start working on anything, please [discuss with us](https://github.com/tlaplus/tlaplus/issues) what you want to do. You can do that on the [issues page](https://github.com/tlaplus/tlaplus/issues). We do not want to reject your 1k LOC patch because the actual change is not considered sensible by us.