diff --git a/components/http_foundation/trusting_proxies.rst b/components/http_foundation/trusting_proxies.rst
index 591a58b09b7..fcd32d70b83 100644
--- a/components/http_foundation/trusting_proxies.rst
+++ b/components/http_foundation/trusting_proxies.rst
@@ -15,7 +15,7 @@ headers by default. If you are behind a proxy, you should manually whitelist
 your proxy.
 
 .. versionadded:: 2.3
-    CIDR notation support was introduced, so you can whitelist whole
+    CIDR notation support was introduced in Symfony 2.3, so you can whitelist whole
     subnets (e.g. ``10.0.0.0/8``, ``fc00::/7``).
 
 .. code-block:: php
diff --git a/reference/configuration/framework.rst b/reference/configuration/framework.rst
index b1a1b7ee1d0..ca972b6bcb1 100644
--- a/reference/configuration/framework.rst
+++ b/reference/configuration/framework.rst
@@ -125,7 +125,7 @@ Configures the IP addresses that should be trusted as proxies. For more details,
 see :doc:`/components/http_foundation/trusting_proxies`.
 
 .. versionadded:: 2.3
-    CIDR notation support was introduced, so you can whitelist whole
+    CIDR notation support was introduced in Symfony 2.3, so you can whitelist whole
     subnets (e.g. ``10.0.0.0/8``, ``fc00::/7``).
 
 .. configuration-block::