diff --git a/core/lib/Drupal/Core/StreamWrapper/ModuleStream.php b/core/lib/Drupal/Core/StreamWrapper/ModuleStream.php
index d88a3c0..1ab0475 100644
--- a/core/lib/Drupal/Core/StreamWrapper/ModuleStream.php
+++ b/core/lib/Drupal/Core/StreamWrapper/ModuleStream.php
@@ -4,6 +4,13 @@
 
 /**
  * Defines the read-only module:// stream wrapper for module files.
+ *
+ * Usage:
+ * @code
+ * module://{name}
+ * @endcode
+ * Points to the module {name} root directory. Only enabled modules can be
+ * referred.
  */
 class ModuleStream extends ExtensionStreamBase {
 
diff --git a/core/lib/Drupal/Core/StreamWrapper/ProfileStream.php b/core/lib/Drupal/Core/StreamWrapper/ProfileStream.php
index 36f34c3..c9ca16e 100644
--- a/core/lib/Drupal/Core/StreamWrapper/ProfileStream.php
+++ b/core/lib/Drupal/Core/StreamWrapper/ProfileStream.php
@@ -4,6 +4,12 @@
 
 /**
  * Defines the read-only profile:// stream wrapper for installed profile files.
+ *
+ * Usage:
+ * @code
+ * profile://
+ * @endcode
+ * Points to the installed profile root directory.
  */
 class ProfileStream extends ModuleStream {
 
diff --git a/core/lib/Drupal/Core/StreamWrapper/ThemeStream.php b/core/lib/Drupal/Core/StreamWrapper/ThemeStream.php
index baf65ac..ddcc1de 100644
--- a/core/lib/Drupal/Core/StreamWrapper/ThemeStream.php
+++ b/core/lib/Drupal/Core/StreamWrapper/ThemeStream.php
@@ -4,6 +4,13 @@
 
 /**
  * Defines the read-only theme:// stream wrapper for theme files.
+ *
+ * Usage:
+ * @code
+ * theme://{name}
+ * @endcode
+ * Points to the theme {name} root directory. Only installed themes can be
+ * referred.
  */
 class ThemeStream extends ExtensionStreamBase {