diff --git a/src/Core/Config/Cache/ConfigCache.php b/src/Core/Config/Cache/ConfigCache.php
index 3119b5db1..bafb3fc95 100644
--- a/src/Core/Config/Cache/ConfigCache.php
+++ b/src/Core/Config/Cache/ConfigCache.php
@@ -68,7 +68,7 @@ class ConfigCache
 	 *
 	 * @return null|mixed Returns the value of the Config entry or null if not set
 	 */
-	public function get(string $cat, string $key = null)
+	public function get(string $cat, $key = null)
 	{
 		if (isset($this->config[$cat][$key])) {
 			return $this->config[$cat][$key];
diff --git a/src/Core/Config/JitConfiguration.php b/src/Core/Config/JitConfiguration.php
index e5b7b5e47..40aa5d6f6 100644
--- a/src/Core/Config/JitConfiguration.php
+++ b/src/Core/Config/JitConfiguration.php
@@ -5,10 +5,11 @@ namespace Friendica\Core\Config;
 use Friendica\Model;
 
 /**
- * This class is responsible for all system-wide configuration values in Friendica
- * There are two types of storage
- * - The Config-Files    (loaded into the FileCache @see Cache\ConfigCache )
- * - The Config-DB-Table (per Config-DB-model @see Model\Config\Config )
+ * This class implements the Just-In-Time configuration, which will cache
+ * config values in a cache, once they are retrieved.
+ *
+ * Default Configuration type.
+ * Provides the best performance for pages loading few configuration variables.
  */
 class JitConfiguration extends Configuration
 {
@@ -106,16 +107,7 @@ class JitConfiguration extends Configuration
 	}
 
 	/**
-	 * @brief Deletes the given key from the system configuration.
-	 *
-	 * Removes the configured value from the stored cache in $this->configCache
-	 * (@param string $cat The category of the configuration value
-	 *
-	 * @param string $key The configuration key to delete
-	 *
-	 * @return bool
-	 * @see   ConfigCache ) and removes it from the database (@see IConfigAdapter ).
-	 *
+	 * {@inheritDoc}
 	 */
 	public function delete(string $cat, string $key)
 	{
diff --git a/src/Core/Config/PreloadConfiguration.php b/src/Core/Config/PreloadConfiguration.php
index bf57661a1..b5823c614 100644
--- a/src/Core/Config/PreloadConfiguration.php
+++ b/src/Core/Config/PreloadConfiguration.php
@@ -5,10 +5,10 @@ namespace Friendica\Core\Config;
 use Friendica\Model;
 
 /**
- * This class is responsible for all system-wide configuration values in Friendica
- * There are two types of storage
- * - The Config-Files    (loaded into the FileCache @see Cache\ConfigCache )
- * - The Config-DB-Table (per Config-DB-model @see Model\Config\Config )
+ * This class implements the preload Time configuration, which will cache
+ * all config values per call in a cache.
+ *
+ * Minimizes the number of database queries to retrieve configuration values at the cost of memory.
  */
 class PreloadConfiguration extends Configuration
 {