diff --git a/includes/class-wc-product-external.php b/includes/class-wc-product-external.php
index bef2bcf9b2c..3b5423fe398 100644
--- a/includes/class-wc-product-external.php
+++ b/includes/class-wc-product-external.php
@@ -30,7 +30,7 @@ class WC_Product_External extends WC_Product {
 	 * Returns false if the product cannot be bought.
 	 *
 	 * @access public
-	 * @return cool
+	 * @return bool
 	 */
 	public function is_purchasable() {
 		return apply_filters( 'woocommerce_is_purchasable', false, $this );
@@ -85,4 +85,4 @@ class WC_Product_External extends WC_Product {
 	public function get_button_text() {
 		return $this->button_text ? $this->button_text : __( 'Buy product', 'woocommerce' );
 	}
-}
\ No newline at end of file
+}
diff --git a/includes/class-wc-product-grouped.php b/includes/class-wc-product-grouped.php
index e6a2861fdaa..98d84454a2f 100644
--- a/includes/class-wc-product-grouped.php
+++ b/includes/class-wc-product-grouped.php
@@ -154,7 +154,7 @@ class WC_Product_Grouped extends WC_Product {
 	 * Returns false if the product cannot be bought.
 	 *
 	 * @access public
-	 * @return cool
+	 * @return bool
 	 */
 	public function is_purchasable() {
 		return apply_filters( 'woocommerce_is_purchasable', false, $this );
diff --git a/includes/class-wc-product-variation.php b/includes/class-wc-product-variation.php
index aca3141b2f2..d3eafa83984 100644
--- a/includes/class-wc-product-variation.php
+++ b/includes/class-wc-product-variation.php
@@ -240,7 +240,7 @@ class WC_Product_Variation extends WC_Product {
 	 * Returns false if the product cannot be bought.
 	 *
 	 * @access public
-	 * @return cool
+	 * @return bool
 	 */
 	public function is_purchasable() {