diff --git a/includes/abstracts/abstract-wc-widget.php b/includes/abstracts/abstract-wc-widget.php
index 6daceaf38ba..6d25d83f7e5 100644
--- a/includes/abstracts/abstract-wc-widget.php
+++ b/includes/abstracts/abstract-wc-widget.php
@@ -60,7 +60,8 @@ abstract class WC_Widget extends WP_Widget {
 
 	/**
 	 * Flush the cache
-	 * @return [type]
+	 *
+	 * @return void
 	 */
 	public function flush_widget_cache() {
 		wp_cache_delete( apply_filters( 'woocommerce_cached_widget_id', $this->widget_id ), 'widget' );
@@ -151,4 +152,4 @@ abstract class WC_Widget extends WP_Widget {
 			}
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/includes/admin/class-wc-admin.php b/includes/admin/class-wc-admin.php
index 82e0c97ffb3..2c3b0dec66c 100644
--- a/includes/admin/class-wc-admin.php
+++ b/includes/admin/class-wc-admin.php
@@ -98,7 +98,8 @@ class WC_Admin {
 
 	/**
 	 * Preview email template
-	 * @return [type]
+	 *
+	 * @return string
 	 */
 	public function preview_emails() {
 		if ( isset( $_GET['preview_woocommerce_mail'] ) ) {
diff --git a/includes/class-wc-comments.php b/includes/class-wc-comments.php
index 1f14e9f52c3..b7698b8e3a2 100644
--- a/includes/class-wc-comments.php
+++ b/includes/class-wc-comments.php
@@ -208,7 +208,7 @@ class WC_Comments {
 	/**
 	 * Clear transients for a review.
 	 *
-	 * @param mixed $comment_id
+	 * @param mixed $post_id
 	 */
 	public static function clear_transients( $post_id ) {
 		delete_transient( 'wc_average_rating_' . absint( $post_id ) );
diff --git a/includes/class-wc-customer.php b/includes/class-wc-customer.php
index 05089f281a6..6b7e15f13ad 100644
--- a/includes/class-wc-customer.php
+++ b/includes/class-wc-customer.php
@@ -418,7 +418,7 @@ class WC_Customer {
 	 * Sets session data for the city.
 	 *
 	 * @access public
-	 * @param mixed $postcode
+	 * @param mixed $city
 	 */
 	public function set_city( $city ) {
 		$this->city = $city;
@@ -494,7 +494,7 @@ class WC_Customer {
 	 * Sets session data for the city.
 	 *
 	 * @access public
-	 * @param string $postcode
+	 * @param string $city
 	 */
 	public function set_shipping_city( $city ) {
 		$this->shipping_city = $city;
diff --git a/includes/class-wc-query.php b/includes/class-wc-query.php
index 3ffc78aba04..716ef76fa61 100644
--- a/includes/class-wc-query.php
+++ b/includes/class-wc-query.php
@@ -117,7 +117,8 @@ class WC_Query {
 
 	/**
 	 * Get query vars
-	 * @return array()
+	 *
+	 * @return array
 	 */
 	public function get_query_vars() {
 		return $this->query_vars;
diff --git a/tests/install-wp-tests.sh b/tests/install-wp-tests.sh
old mode 100755
new mode 100644