diff --git a/wp-includes/option.php b/wp-includes/option.php
index 4cc8c28fa0..1cf3e66c12 100644
--- a/wp-includes/option.php
+++ b/wp-includes/option.php
@@ -551,13 +551,13 @@ function delete_transient( $transient ) {
 /**
  * Get the value of a transient.
  *
- * If the transient does not exist or does not have a value, then the return value
- * will be false.
+ * If the transient does not exist, does not have a value, or has expired,
+ * then the return value will be false.
  *
  * @since 2.8.0
  *
- * @param string $transient Transient name. Expected to not be SQL-escaped
- * @return mixed Value of transient
+ * @param string $transient Transient name. Expected to not be SQL-escaped.
+ * @return mixed Value of transient.
  */
 function get_transient( $transient ) {
 
@@ -1287,15 +1287,15 @@ function delete_site_transient( $transient ) {
 /**
  * Get the value of a site transient.
  *
- * If the transient does not exist or does not have a value, then the return value
- * will be false.
+ * If the transient does not exist, does not have a value, or has expired,
+ * then the return value will be false.
  *
  * @since 2.9.0
  *
  * @see get_transient()
  *
  * @param string $transient Transient name. Expected to not be SQL-escaped.
- * @return mixed Value of transient
+ * @return mixed Value of transient.
  */
 function get_site_transient( $transient ) {