Add runtimes in reference

Signed-off-by: Vitor Savian <[email protected]>

docs/reference/env-variables.md

@@ -40,4 +40,21 @@ Environment variables which begin with `K3S_` will be preserved for the systemd
 
 Setting `K3S_URL` without explicitly setting an exec command will default the command to "agent".
 
-When running the agent, `K3S_TOKEN` must also be set.
+When running the agent, `K3S_TOKEN` must also be set.
+
+:::info Version Gate
+Available as of October 2024 releases: v1.28.15+k3s1, v1.29.10+k3s1, v1.30.6+k3s1, v1.31.2+k3s1.
+
+K3s will now use `PATH` to find runtimes, but it's necessary to add the `PATH` within the `k3s.service.env` or `k3s-agent.service.env` if you are using a agent.
+
+This example will add the PATH to `k3s.service.env` in the default directory:
+
+```bash
+echo PATH=$PATH >> /etc/systemd/system/k3s.service.env
+```
+
+:::warning
+
+`PATH` changes should be done with care to avoid security breaches or attacks.
+
+:::