diff --git a/core/modules/datetime/src/Plugin/views/argument/DayDate.php b/core/modules/datetime/src/Plugin/views/argument/DayDate.php
index 17d5cbd..f100db0 100644
--- a/core/modules/datetime/src/Plugin/views/argument/DayDate.php
+++ b/core/modules/datetime/src/Plugin/views/argument/DayDate.php
@@ -8,7 +8,7 @@
 namespace Drupal\datetime\Plugin\views\argument;
 
 /**
- * Argument handler for a day (DD)
+ * Argument handler for a day.
  *
  * @ViewsArgument("datetime_day")
  */
diff --git a/core/modules/datetime/src/Plugin/views/argument/MonthDate.php b/core/modules/datetime/src/Plugin/views/argument/MonthDate.php
index 1340eca..2aac64d 100644
--- a/core/modules/datetime/src/Plugin/views/argument/MonthDate.php
+++ b/core/modules/datetime/src/Plugin/views/argument/MonthDate.php
@@ -8,7 +8,7 @@
 namespace Drupal\datetime\Plugin\views\argument;
 
 /**
- * Argument handler for a month (MM)
+ * Argument handler for a month.
  *
  * @ViewsArgument("datetime_month")
  */
diff --git a/core/modules/datetime/src/Plugin/views/argument/YearDate.php b/core/modules/datetime/src/Plugin/views/argument/YearDate.php
index de6827c..c34dde3 100644
--- a/core/modules/datetime/src/Plugin/views/argument/YearDate.php
+++ b/core/modules/datetime/src/Plugin/views/argument/YearDate.php
@@ -8,7 +8,7 @@
 namespace Drupal\datetime\Plugin\views\argument;
 
 /**
- * Argument handler for a year (CCYY)
+ * Argument handler for a year.
  *
  * @ViewsArgument("datetime_year")
  */