diff --git a/src/Module/SundayModule.php b/src/Module/SundayModule.php
index 85d2f856..e331329e 100644
--- a/src/Module/SundayModule.php
+++ b/src/Module/SundayModule.php
@@ -11,6 +11,9 @@
 use BEAR\Sunday\Provide\Transfer\HttpResponderModule;
 use Ray\Di\AbstractModule;
 
+/**
+ * Provides BEAR.Sunday base bindings
+ */
 class SundayModule extends AbstractModule
 {
     protected function configure(): void
diff --git a/src/Provide/Router/RouterModule.php b/src/Provide/Router/RouterModule.php
index 4194c666..731a935c 100644
--- a/src/Provide/Router/RouterModule.php
+++ b/src/Provide/Router/RouterModule.php
@@ -8,6 +8,14 @@
 use BEAR\Sunday\Extension\Router\RouterInterface;
 use Ray\Di\AbstractModule;
 
+/**
+ * Provides RouterInterface and derived bindings
+ *
+ * The following bindings are provided:
+ *
+ *  RouterInterface
+ *  -DefaultSchemeHost
+ */
 class RouterModule extends AbstractModule
 {
     protected function configure(): void
diff --git a/src/Provide/Transfer/HttpCacheModule.php b/src/Provide/Transfer/HttpCacheModule.php
index 766c0686..34220c36 100644
--- a/src/Provide/Transfer/HttpCacheModule.php
+++ b/src/Provide/Transfer/HttpCacheModule.php
@@ -8,6 +8,9 @@
 use BEAR\Sunday\Extension\Transfer\NullHttpCache;
 use Ray\Di\AbstractModule;
 
+/**
+ * Provides HttpCacheInterface bindings
+ */
 class HttpCacheModule extends AbstractModule
 {
     protected function configure(): void
diff --git a/src/Provide/Transfer/HttpResponderModule.php b/src/Provide/Transfer/HttpResponderModule.php
index a1d6a361..144d1e25 100644
--- a/src/Provide/Transfer/HttpResponderModule.php
+++ b/src/Provide/Transfer/HttpResponderModule.php
@@ -7,6 +7,15 @@
 use BEAR\Sunday\Extension\Transfer\TransferInterface;
 use Ray\Di\AbstractModule;
 
+/**
+ * Provides TransferInterface and derived bindings
+ *
+ * The following bindings are provided:
+ *
+ *  TransferInterface
+ *  HeaderInterface
+ *  ConditionalResponseInterface
+ */
 class HttpResponderModule extends AbstractModule
 {
     protected function configure(): void