diff --git a/system/src/Grav/Common/Filesystem/Folder.php b/system/src/Grav/Common/Filesystem/Folder.php
index 6026d8f04..af1b93352 100644
--- a/system/src/Grav/Common/Filesystem/Folder.php
+++ b/system/src/Grav/Common/Filesystem/Folder.php
@@ -64,8 +64,8 @@ abstract class Folder
     /**
      * Get relative path between target and base path. If path isn't relative, return full path.
      *
-     * @param  string  $path
-     * @param  string  $base
+     * @param  string $path
+     * @param mixed|string $base
      * @return string
      */
     public static function getRelativePath($path, $base = GRAV_ROOT)
diff --git a/system/src/Grav/Common/GPM/Remote/Plugins.php b/system/src/Grav/Common/GPM/Remote/Plugins.php
index ec6d64521..df8668491 100644
--- a/system/src/Grav/Common/GPM/Remote/Plugins.php
+++ b/system/src/Grav/Common/GPM/Remote/Plugins.php
@@ -16,6 +16,8 @@ class Plugins extends AbstractPackageCollection
 
     /**
      * Local Plugins Constructor
+     * @param bool $refresh
+     * @param callable $callback Either a function or callback in array notation
      */
     public function __construct($refresh = false, $callback = null)
     {
diff --git a/system/src/Grav/Common/GPM/Remote/Themes.php b/system/src/Grav/Common/GPM/Remote/Themes.php
index 759b7e10a..0af055b03 100644
--- a/system/src/Grav/Common/GPM/Remote/Themes.php
+++ b/system/src/Grav/Common/GPM/Remote/Themes.php
@@ -16,6 +16,8 @@ class Themes extends AbstractPackageCollection
 
     /**
      * Local Themes Constructor
+     * @param bool $refresh
+     * @param callable $callback Either a function or callback in array notation
      */
     public function __construct($refresh = false, $callback = null)
     {
diff --git a/system/src/Grav/Common/GPM/Response.php b/system/src/Grav/Common/GPM/Response.php
index 4f61e2b42..d2b446b3b 100644
--- a/system/src/Grav/Common/GPM/Response.php
+++ b/system/src/Grav/Common/GPM/Response.php
@@ -50,6 +50,7 @@ class Response
     /**
      * Sets the preferred method to use for making HTTP calls.
      * @param string $method Default is `auto`
+     * @return Response
      */
     public static function setMethod($method = 'auto')
     {
@@ -64,8 +65,9 @@ class Response
 
     /**
      * Makes a request to the URL by using the preferred method
-     * @param  string $uri     URL to call
-     * @param  array  $options An array of parameters for both `curl` and `fopen`
+     * @param  string $uri URL to call
+     * @param  array $options An array of parameters for both `curl` and `fopen`
+     * @param  callable $callback Either a function or callback in array notation
      * @return string The response of the request
      */
     public static function get($uri = '', $options = [], $callback = null)