diff --git a/jsonapi.api.php b/jsonapi.api.php
index 1a09422..8c63bfc 100644
--- a/jsonapi.api.php
+++ b/jsonapi.api.php
@@ -97,7 +97,7 @@
  *                   /     \
  * ?resource_version=foo:bar
  *                   \_/ \_/
- *                   |    |
+ *                    |   |
  *    version-negotiator  |
  *                version-argument
  * @endcode
@@ -108,7 +108,7 @@
  * @endcode or @code rel @endcode. The @code id @endcode negotiator takes a
  * version argument which is the desired revision ID. The @code rel @endcode
  * negotiator takes a version argument which is either the string @code
- * latest-version @encode or the string @code latest-version @encode.
+ * latest-version @endcode or the string @code working-copy @endcode.
  *
  * In future, other negotiators may be developed. For instance, a negotiator
  * which is timestamp or workspace based.
diff --git a/src/Revisions/Annotation/VersionNegotiation.php b/src/Revisions/Annotation/VersionNegotiation.php
index 9cade53..9aa85c9 100644
--- a/src/Revisions/Annotation/VersionNegotiation.php
+++ b/src/Revisions/Annotation/VersionNegotiation.php
@@ -5,7 +5,7 @@ namespace Drupal\jsonapi\Revisions\Annotation;
 use Drupal\Component\Annotation\Plugin;
 
 /**
- * Defines an version negotiation plugin annotation object.
+ * Defines a version negotiation plugin annotation object.
  *
  * Plugin Namespace: Plugin\VersionNegotiation.
  *
diff --git a/src/Revisions/ResourceVersionRouteEnhancer.php b/src/Revisions/ResourceVersionRouteEnhancer.php
index ca601a0..f03f6a3 100644
--- a/src/Revisions/ResourceVersionRouteEnhancer.php
+++ b/src/Revisions/ResourceVersionRouteEnhancer.php
@@ -44,7 +44,7 @@ class ResourceVersionRouteEnhancer implements EnhancerInterface {
    *
    * @var string
    */
-  const RESOURCE_VERSION_PARAM_VALIDATOR = '/^[a-z]+[a-z_]*[a-z]+'
+  const VERSION_IDENTIFIER_VALIDATOR = '/^[a-z]+[a-z_]*[a-z]+'
   . VersionNegotiationManager::SEPARATOR
   . '[a-zA-Z0-9\-]+('
   . VersionNegotiationManager::SEPARATOR
@@ -89,7 +89,7 @@ class ResourceVersionRouteEnhancer implements EnhancerInterface {
 
     $resource_version_identifier = $request->query->get(static::RESOURCE_VERSION_QUERY_PARAMETER);
 
-    if (!static::isValidResourceVersionIdentifier($resource_version_identifier)) {
+    if (!static::isValidVersionIdentifier($resource_version_identifier)) {
       $cacheability = (new CacheableMetadata())->addCacheContexts(['url.query_args:' . ResourceVersionRouteEnhancer::RESOURCE_VERSION_QUERY_PARAMETER]);
       $message = sprintf('A resource version identifier was provided in an invalid format: `%s`', $resource_version_identifier);
       throw new CacheableBadRequestHttpException($cacheability, $message);
@@ -132,8 +132,8 @@ class ResourceVersionRouteEnhancer implements EnhancerInterface {
    * @return bool
    *   TRUE if the received resource version value is valid, FALSE otherwise.
    */
-  protected static function isValidResourceVersionIdentifier($resource_version) {
-    return preg_match(static::RESOURCE_VERSION_PARAM_VALIDATOR, $resource_version) === 1;
+  protected static function isValidVersionIdentifier($resource_version) {
+    return preg_match(static::VERSION_IDENTIFIER_VALIDATOR, $resource_version) === 1;
   }
 
 }
diff --git a/src/Revisions/VersionNegotiationManager.php b/src/Revisions/VersionNegotiationManager.php
index 0e67a57..6cf9dde 100644
--- a/src/Revisions/VersionNegotiationManager.php
+++ b/src/Revisions/VersionNegotiationManager.php
@@ -13,7 +13,7 @@ use Drupal\Core\Plugin\DefaultPluginManager;
 use Drupal\jsonapi\Revisions\Annotation\VersionNegotiation;
 
 /**
- * Provides an version negotiation plugin manager.
+ * Provides a version negotiation plugin manager.
  *
  * @see \Drupal\jsonapi\Revisions\Annotation\VersionNegotiation
  * @see \Drupal\jsonapi\Revisions\VersionNegotiationInterface