diff --git a/modules/helm/main.k b/modules/helm/main.k
index 1479187..5e0ddb5 100644
--- a/modules/helm/main.k
+++ b/modules/helm/main.k
@@ -1,6 +1,7 @@
 """
 This module provides an interface for the kclx Helm plugin.
 """
+import regex
 import kcl_plugin.helm as helm_plugin
 
 schema Chart:
@@ -9,50 +10,73 @@ schema Chart:
     Attributes
     ----------
     chart: str
-        The name of the chart to install.
+        The Helm chart name.
     repoURL: str
-        The URL of the chart repository.
+        The URL of the Helm chart repository.
     targetRevision: str
-        Version of the chart to install.
-    namespace: str, optional.
-        Namespace to install the chart into.
+        TargetRevision defines the semver tag for the chart's version.
     releaseName: str, optional.
-        Name of the release.
+        The Helm release name to use. If omitted it will use the chart name.
+    namespace: str, optional.
+        Namespace is an optional namespace to template with.
+    project: str, optional.
+        Project is a reference to the project this chart's releases belong to,
+        e.g. the Argo AppProject. This is used to segregate Helm chart caches.
+    helmVersion: str, default is "v3", optional.
+        HelmVersion is the version of Helm to use. One of: [v2, v3].
     skipCRDs: bool, default is False, optional.
-        Set to `True` to skip installing CRDs.
+        Set to `True` to skip the custom resource definition installation step
+        (Helm's `--skip-crds`).
+    passCredentials: bool, default is False, optional.
+        Set to `True` to pass credentials to all domains (Helm's `--pass-credentials`).
     values: any, default is {}, optional.
-        Chart values.
+        Specifies Helm values to be passed to helm template.
+    """
+    chart: str
+    repoURL: str
+    targetRevision: str
+    releaseName?: str
+    namespace?: str
+    project?: str
+    helmVersion?: str = "v3"
+    skipCRDs?: bool = False
+    passCredentials?: bool = False
+    values?: any = {}
+
+    check:
+        not regex.match(repoURL, r"^oci://"), \
+            "Invalid repoURL: ${repoURL}. OCI registries must not include a scheme (e.g. `oci://`)"
+        any x in ["v2", "v3"] {
+            x == helmVersion
+        }, "Invalid helmVersion: ${helmVersion}. Must be one of: [v2, v3]"
+
+template = lambda chart: Chart -> [{str:}] {
+    """Render Helm chart templates using `kclx`'s `kcl_plugin.helm.template`.
 
     Examples
     --------
+    ```kcl
     helm.template(helm.Chart {
         chart = "my-chart"
-        targetRevision = "1.0.0"
         repoURL = "https://jacobcolvin.com/helm-charts"
+        targetRevision = "1.0.0"
         values = {
             foo = "bar"
             bar = "foo"
         }
     })
+    ```
     """
-    chart: str
-    targetRevision: str
-    repoURL: str
-    releaseName?: str
-    namespace?: str
-    project?: str
-    skipCRDs?: bool = False
-    values?: any = {}
-
-template = lambda c: Chart -> {str:} {
     helm_plugin.template(
-        chart=c.chart,
-        target_revision=c.targetRevision,
-        repo_url=c.repoURL,
-        release_name=c.releaseName,
-        namespace=c.namespace,
-        project=c.project,
-        skip_crds=c.skipCRDs,
-        values=c.values,
+        chart=chart.chart,
+        repo_url=chart.repoURL,
+        target_revision=chart.targetRevision,
+        release_name=chart.releaseName,
+        namespace=chart.namespace,
+        project=chart.project,
+        helm_version=chart.helmVersion,
+        skip_crds=chart.skipCRDs,
+        pass_credentials=chart.passCredentials,
+        values=chart.values,
     )
 }
diff --git a/modules/helm/main_test.k b/modules/helm/main_test.k
new file mode 100644
index 0000000..06f305a
--- /dev/null
+++ b/modules/helm/main_test.k
@@ -0,0 +1,21 @@
+test_Chart = lambda {
+    https = Chart {
+        chart = "test-https"
+        repoURL = "https://example.com"
+        targetRevision = "0.1.0"
+        helmVersion = "v3"
+    }
+
+    oci = Chart {
+        chart = "test-oci"
+        repoURL = "example.com"
+        targetRevision = "0.1.0"
+    }
+
+    helmV2 = Chart {
+        chart = "test-helm-v2"
+        repoURL = "https://example.com"
+        targetRevision = "0.1.0"
+        helmVersion = "v2"
+    }
+}
diff --git a/pkg/helm/plugin.go b/pkg/helm/plugin.go
index 739e34c..177cf02 100644
--- a/pkg/helm/plugin.go
+++ b/pkg/helm/plugin.go
@@ -28,7 +28,7 @@ func init() {
 						"pass_credentials": "bool",
 						"values":           "{str:any}",
 					},
-					ResultType: "{str:any}",
+					ResultType: "[{str:any}]",
 				},
 				Body: func(args *plugin.MethodArgs) (*plugin.MethodResult, error) {
 					safeArgs := pluginutil.SafeMethodArgs{Args: args}