diff --git a/application/Espo/Core/Api/Request.php b/application/Espo/Core/Api/Request.php
index 499cf9acf3..34184c4189 100644
--- a/application/Espo/Core/Api/Request.php
+++ b/application/Espo/Core/Api/Request.php
@@ -31,6 +31,9 @@ namespace Espo\Core\Api;
 
 use Psr\Http\Message\UriInterface;
 
+/**
+ * Representation of an HTTP request.
+ */
 interface Request
 {
     /**
diff --git a/application/Espo/Core/Api/RequestWrapper.php b/application/Espo/Core/Api/RequestWrapper.php
index 274e33c4a9..c5ff943431 100644
--- a/application/Espo/Core/Api/RequestWrapper.php
+++ b/application/Espo/Core/Api/RequestWrapper.php
@@ -36,6 +36,9 @@ use Psr\Http\Message\{
 
 use Espo\Core\Api\Request as ApiRequest;
 
+/**
+ * Adapter for PSR-7 request interface.
+ */
 class RequestWrapper implements ApiRequest
 {
     protected $request;
diff --git a/application/Espo/Core/Api/Response.php b/application/Espo/Core/Api/Response.php
index 49a8d4875c..e659371b72 100644
--- a/application/Espo/Core/Api/Response.php
+++ b/application/Espo/Core/Api/Response.php
@@ -34,6 +34,9 @@ use Psr\Http\Message\{
     StreamInterface,
 };
 
+/**
+ * Representation of an HTTP response. An instance is mutable.
+ */
 interface Response
 {
     /**
@@ -67,7 +70,7 @@ interface Response
     public function setBody(StreamInterface $body);
 
     /**
-     * Get a result psr7 response.
+     * Get a result PSR-7 response.
      */
     public function getResponse() : Psr7Response;
 }
\ No newline at end of file
diff --git a/application/Espo/Core/Api/ResponseWrapper.php b/application/Espo/Core/Api/ResponseWrapper.php
index d551add36b..7d74c2d254 100644
--- a/application/Espo/Core/Api/ResponseWrapper.php
+++ b/application/Espo/Core/Api/ResponseWrapper.php
@@ -36,6 +36,9 @@ use Psr\Http\Message\{
 
 use Espo\Core\Api\Response as ApiResponse;
 
+/**
+ * Adapter for PSR-7 response interface.
+ */
 class ResponseWrapper implements ApiResponse
 {
     protected $response;