diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 95426be2..96dd276b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -9,7 +9,7 @@ $ ./scripts/lint
 
 This will install all the required dependencies and build the SDK.
 
-You can also [install go 1.18+ manually](https://go.dev/doc/install).
+You can also [install Go 1.21+ manually](https://go.dev/doc/install).
 
 ## Modifying/Adding code
 
diff --git a/README.md b/README.md
index 07370d9c..e1615406 100644
--- a/README.md
+++ b/README.md
@@ -872,7 +872,7 @@ func Logger(req *http.Request, next option.MiddlewareNext) (res *http.Response,
 
 	// Handle stuff after the request
 	end := time.Now()
-	LogRes(res, err, start - end)
+	LogRes(res, err, end.Sub(start))
 
     return res, err
 }
@@ -895,13 +895,15 @@ middleware has been applied.
 
 ## Microsoft Azure OpenAI
 
-To use this library with [Azure OpenAI]https://learn.microsoft.com/azure/ai-services/openai/overview),
+To use this library with [Azure OpenAI](https://learn.microsoft.com/azure/ai-services/openai/overview),
 use the option.RequestOption functions in the `azure` package.
 
 ```go
 package main
 
 import (
+	"fmt"
+	"os"
 	"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
 	"github.com/openai/openai-go/v2"
 	"github.com/openai/openai-go/v2/azure"
@@ -911,7 +913,7 @@ func main() {
 	const azureOpenAIEndpoint = "https://<azure-openai-resource>.openai.azure.com"
 
 	// The latest API versions, including previews, can be found here:
-	// https://learn.microsoft.com/en-us/azure/ai-services/openai/reference#rest-api-versionng
+	// https://learn.microsoft.com/en-us/azure/ai-services/openai/reference#rest-api-versioning
 	const azureOpenAIAPIVersion = "2024-06-01"
 
 	tokenCredential, err := azidentity.NewDefaultAzureCredential(nil)
diff --git a/azure/azure.go b/azure/azure.go
index 866e80ad..559f2a8f 100644
--- a/azure/azure.go
+++ b/azure/azure.go
@@ -121,7 +121,7 @@ func WithTokenCredential(tokenCredential azcore.TokenCredential) option.RequestO
 // WithAPIKey configures this client to authenticate using an API key.
 // This function should be paired with a call to [WithEndpoint] to point to your Azure OpenAI instance.
 func WithAPIKey(apiKey string) option.RequestOption {
-	// NOTE: there is an option.WithApiKey(), but that adds the value into
+	// NOTE: there is an option.WithAPIKey(), but that adds the value into
 	// the Authorization header instead so we're doing this instead.
 	return option.WithHeader("Api-Key", apiKey)
 }
@@ -234,4 +234,4 @@ func (mp policyAdapter) Do(req *policy.Request) (*http.Response, error) {
 	return (option.MiddlewareNext)(mp)(req.Raw())
 }
 
-const version = "v.0.1.0"
+const version = "v0.1.0"
diff --git a/option/requestoption.go b/option/requestoption.go
index b48feb5a..13405ddd 100644
--- a/option/requestoption.go
+++ b/option/requestoption.go
@@ -33,7 +33,7 @@ func WithBaseURL(base string) RequestOption {
 
 	return requestconfig.RequestOptionFunc(func(r *requestconfig.RequestConfig) error {
 		if err != nil {
-			return fmt.Errorf("requestoption: WithBaseURL failed to parse url %s", err)
+			return fmt.Errorf("requestoption: WithBaseURL failed to parse base URL %q: %v", base, err)
 		}
 
 		r.BaseURL = u
@@ -232,7 +232,7 @@ func WithResponseInto(dst **http.Response) RequestOption {
 // WithRequestBody returns a RequestOption that provides a custom serialized body with the given
 // content type.
 //
-// body accepts an io.Reader or raw []bytes.
+// body accepts an io.Reader or raw []byte.
 func WithRequestBody(contentType string, body any) RequestOption {
 	return requestconfig.RequestOptionFunc(func(r *requestconfig.RequestConfig) error {
 		if reader, ok := body.(io.Reader); ok {
@@ -270,7 +270,7 @@ func WithEnvironmentProduction() RequestOption {
 func WithAPIKey(value string) RequestOption {
 	return requestconfig.RequestOptionFunc(func(r *requestconfig.RequestConfig) error {
 		r.APIKey = value
-		return r.Apply(WithHeader("authorization", fmt.Sprintf("Bearer %s", r.APIKey)))
+		return r.Apply(WithHeader("Authorization", fmt.Sprintf("Bearer %s", r.APIKey)))
 	})
 }