diff --git a/Dockerfile b/Dockerfile
index 62129fa..fb96ffd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -55,7 +55,8 @@ RUN if [ "$TARGETPLATFORM" = "linux/arm64" ]; then \
        curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "/tmp/awscliv2.zip"; \
     fi && \
     unzip "/tmp/awscliv2.zip" && \
-    ./aws/install
+    ./aws/install && \
+    rm -rf /aws /tmp/awscliv2.zip
 
 WORKDIR /
 
diff --git a/input/v1alpha1/parameters.go b/input/v1alpha1/parameters.go
index 81445d1..0f8a591 100644
--- a/input/v1alpha1/parameters.go
+++ b/input/v1alpha1/parameters.go
@@ -94,7 +94,7 @@ func (sev *ShellEnvVar) GetType() ShellEnvVarType {
 	return sev.Type
 }
 
-// ShellEnvVarsRef refers to an environment variable or secret leaded into
+// ShellEnvVarsRef refers to an environment variable or secret loaded into
 // the function pod.
 type ShellEnvVarsRef struct {
 	// The Key whose value is the secret
diff --git a/package/input/template.fn.crossplane.io_parameters.yaml b/package/input/template.fn.crossplane.io_parameters.yaml
index d19e627..bdbc65b 100644
--- a/package/input/template.fn.crossplane.io_parameters.yaml
+++ b/package/input/template.fn.crossplane.io_parameters.yaml
@@ -3,7 +3,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.18.0
+    controller-gen.kubebuilder.io/version: v0.21.0
   name: parameters.template.fn.crossplane.io
 spec:
   group: template.fn.crossplane.io
@@ -19,7 +19,7 @@ spec:
   - name: v1alpha1
     schema:
       openAPIV3Schema:
-        description: Input can be used to provide input to this Function.
+        description: Parameters can be used to provide input to this Function.
         properties:
           apiVersion:
             description: |-
@@ -54,9 +54,11 @@ spec:
           shellEnvVars:
             description: shellEnvVars
             items:
+              description: ShellEnvVar is a Shell Environment Variable of the form
+                key=value.
               properties:
                 fieldRef:
-                  description: FieldRef is a reference to a field in the Composition
+                  description: FieldRef is a reference to a field in the Composition.
                   properties:
                     defaultValue:
                       description: DefaultValue when Policy is Optional and field
@@ -79,13 +81,18 @@ spec:
                   - path
                   type: object
                 key:
+                  description: Key is the Environment Variable key like API_KEY
                   type: string
                 type:
-                  description: ShellEnvVarType is a type of ShellEnvVar
+                  description: 'Type is the type of ShellEnVar: Value, ValueRef, FieldRef.'
                   type: string
                 value:
+                  description: Value is a fixed value, like http://api.example.com
                   type: string
                 valueRef:
+                  description: |-
+                    ValueRef retrieves a Environment Variable value from a composite field.
+                    Can result in error if field is not set: use FieldRef which can handle missing fields.
                   type: string
               type: object
             type: array
@@ -107,6 +114,8 @@ spec:
           stdoutField:
             description: stdoutField
             type: string
+        required:
+        - metadata
         type: object
     served: true
     storage: true