diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 2dfd22f95..bd3cc4d0d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -35,12 +35,12 @@ We expect that all commit messages follow the
 
 Please use the `scope` field to indicate the area of the codebase that is being
 changed. For example, `vm` for changes in the Virtual Machine resource, or
-`lcx` for changes in the Container resource.
+`lxc` for changes in the Container resource.
 
 Common scopes are:
 
 - `vm` - Virtual Machine resources
-- `lcx` - Container resources
+- `lxc` - Container resources
 - `provider` - Provider configuration and resources
 - `core` - Core libraries and utilities
 - `docs` - Documentation
diff --git a/proxmoxtf/resource/container.go b/proxmoxtf/resource/container.go
index e179b3836..f7cef5f6a 100644
--- a/proxmoxtf/resource/container.go
+++ b/proxmoxtf/resource/container.go
@@ -1486,6 +1486,7 @@ func containerGetOperatingSystemTypeValidator() schema.SchemaValidateDiagFunc {
 		"debian",
 		"fedora",
 		"gentoo",
+		"nixos",
 		"opensuse",
 		"ubuntu",
 		"unmanaged",