diff --git a/src/MessageFactory/DiactorosMessageFactory.php b/src/MessageFactory/DiactorosMessageFactory.php
index 53f08ae..10a49f2 100644
--- a/src/MessageFactory/DiactorosMessageFactory.php
+++ b/src/MessageFactory/DiactorosMessageFactory.php
@@ -11,6 +11,8 @@
  * Creates Diactoros messages.
  *
  * @author GeLo <geloen.eric@gmail.com>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Diactoros PSR-17 factory
  */
 final class DiactorosMessageFactory implements MessageFactory
 {
diff --git a/src/MessageFactory/GuzzleMessageFactory.php b/src/MessageFactory/GuzzleMessageFactory.php
index 59eb655..02989d9 100644
--- a/src/MessageFactory/GuzzleMessageFactory.php
+++ b/src/MessageFactory/GuzzleMessageFactory.php
@@ -10,6 +10,8 @@
  * Creates Guzzle messages.
  *
  * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Guzzle PSR-17 factory
  */
 final class GuzzleMessageFactory implements MessageFactory
 {
diff --git a/src/MessageFactory/SlimMessageFactory.php b/src/MessageFactory/SlimMessageFactory.php
index cdad2ec..869cf77 100644
--- a/src/MessageFactory/SlimMessageFactory.php
+++ b/src/MessageFactory/SlimMessageFactory.php
@@ -13,6 +13,8 @@
  * Creates Slim 3 messages.
  *
  * @author Mika Tuupola <tuupola@appelsiini.net>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Slim PSR-17 factory
  */
 final class SlimMessageFactory implements MessageFactory
 {
diff --git a/src/StreamFactory/DiactorosStreamFactory.php b/src/StreamFactory/DiactorosStreamFactory.php
index a75ec98..95bf0ca 100644
--- a/src/StreamFactory/DiactorosStreamFactory.php
+++ b/src/StreamFactory/DiactorosStreamFactory.php
@@ -10,6 +10,8 @@
  * Creates Diactoros streams.
  *
  * @author Михаил Красильников <m.krasilnikov@yandex.ru>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Diactoros PSR-17 factory
  */
 final class DiactorosStreamFactory implements StreamFactory
 {
diff --git a/src/StreamFactory/GuzzleStreamFactory.php b/src/StreamFactory/GuzzleStreamFactory.php
index 10f4d3f..9adeeb5 100644
--- a/src/StreamFactory/GuzzleStreamFactory.php
+++ b/src/StreamFactory/GuzzleStreamFactory.php
@@ -8,6 +8,8 @@
  * Creates Guzzle streams.
  *
  * @author Михаил Красильников <m.krasilnikov@yandex.ru>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Guzzle PSR-17 factory
  */
 final class GuzzleStreamFactory implements StreamFactory
 {
diff --git a/src/StreamFactory/SlimStreamFactory.php b/src/StreamFactory/SlimStreamFactory.php
index efcadc4..9274aae 100644
--- a/src/StreamFactory/SlimStreamFactory.php
+++ b/src/StreamFactory/SlimStreamFactory.php
@@ -10,6 +10,8 @@
  * Creates Slim 3 streams.
  *
  * @author Mika Tuupola <tuupola@appelsiini.net>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Slim PSR-17 factory
  */
 final class SlimStreamFactory implements StreamFactory
 {
diff --git a/src/UriFactory/DiactorosUriFactory.php b/src/UriFactory/DiactorosUriFactory.php
index 268c361..f3b73d0 100644
--- a/src/UriFactory/DiactorosUriFactory.php
+++ b/src/UriFactory/DiactorosUriFactory.php
@@ -10,6 +10,8 @@
  * Creates Diactoros URI.
  *
  * @author David de Boer <david@ddeboer.nl>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Diactoros PSR-17 factory
  */
 final class DiactorosUriFactory implements UriFactory
 {
diff --git a/src/UriFactory/GuzzleUriFactory.php b/src/UriFactory/GuzzleUriFactory.php
index 4c1c286..b16ca52 100644
--- a/src/UriFactory/GuzzleUriFactory.php
+++ b/src/UriFactory/GuzzleUriFactory.php
@@ -9,6 +9,8 @@
  * Creates Guzzle URI.
  *
  * @author David de Boer <david@ddeboer.nl>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Guzzle PSR-17 factory
  */
 final class GuzzleUriFactory implements UriFactory
 {
diff --git a/src/UriFactory/SlimUriFactory.php b/src/UriFactory/SlimUriFactory.php
index c013d54..e5bef03 100644
--- a/src/UriFactory/SlimUriFactory.php
+++ b/src/UriFactory/SlimUriFactory.php
@@ -10,6 +10,8 @@
  * Creates Slim 3 URI.
  *
  * @author Mika Tuupola <tuupola@appelsiini.net>
+ *
+ * @deprecated This will be removed in php-http/message2.0. Consider using the official Slim PSR-17 factory
  */
 final class SlimUriFactory implements UriFactory
 {