diff --git a/core/modules/migrate/src/Plugin/migrate/process/StaticMap.php b/core/modules/migrate/src/Plugin/migrate/process/StaticMap.php
index e1043b3..ed3eb3f 100644
--- a/core/modules/migrate/src/Plugin/migrate/process/StaticMap.php
+++ b/core/modules/migrate/src/Plugin/migrate/process/StaticMap.php
@@ -15,11 +15,16 @@
  * The static_map source plugin allows looking up a value based on a map
  * specified in the configuration.
  *
- * Available configuration keys
- * - source:
- * - map:
- * - bypass:
- * - default_value
+ * Available configuration keys:
+ * - source: The input value - either a scalar or an array.
+ * - map: An array (of 1 or more dimensions) that identifies the link between
+ *   source values and destination values.
+ * - bypass: (optional) Whether the plugin should proceed when the source is not
+ *   found in the map array. Defaults to FALSE.
+ *   - TRUE: Do not throw an exception, return the source value.
+ *   - FALSE: Throw a MigrateSkipRowException.
+ * - default_value: (optional) The value to return if the source is not found in
+ *   the map array.
  *
  * Examples:
  *