diff --git a/src/MQTTAsync.h b/src/MQTTAsync.h
index 3c7f0995..3bcf52f1 100644
--- a/src/MQTTAsync.h
+++ b/src/MQTTAsync.h
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2009, 2024 IBM Corp., Ian Craggs and others
+ * Copyright (c) 2009, 2025 IBM Corp., Ian Craggs and others
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
@@ -29,7 +29,7 @@
  * @cond MQTTAsync_main
  * @mainpage Asynchronous MQTT client library for C (MQTTAsync)
  *
- * © Copyright 2009, 2023 IBM Corp., Ian Craggs and others
+ * © Copyright 2009, 2025 IBM Corp., Ian Craggs and others
  *
  * @brief An Asynchronous MQTT client library for C.
  *
@@ -2386,9 +2386,13 @@ exit:
   * of the ::MQTTAsync_connectOptions structure override any settings in the environment.
   *
   * If the environment variable PAHO_C_CLIENT_USE_HTTP_PROXY is set to TRUE, then the
-  * http_proxy or https_proxy environment variables are used, for plain TCP and TLS-secured
-  * connections respectively.
+  * http_proxy or https_proxy (lower case only) environment variables are used, for plain
+  * TCP and TLS-secured connections respectively.
   *
+  * The no_proxy environment variable can be used to exclude certain hosts from using an
+  * environment variable chosen proxy. This does not apply to a proxy selected through the API.
+  * The no_proxy environment variable is lower case only, and is a list of comma-separated
+  * hostname:port values. Suffixes are matched (e.g. example.com will match test.example.com).
   */
 
 #if defined(__cplusplus)
diff --git a/src/MQTTClient.h b/src/MQTTClient.h
index 5c03d117..b5879108 100644
--- a/src/MQTTClient.h
+++ b/src/MQTTClient.h
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2009, 2024 IBM Corp., Ian Craggs and others
+ * Copyright (c) 2009, 2025 IBM Corp., Ian Craggs and others
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
@@ -41,7 +41,7 @@
  * @endcond
  * @cond MQTTClient_main
  * @mainpage MQTT Client library for C (MQTTClient)
- * © Copyright 2009, 2023 IBM Corp., Ian Craggs and others
+ * © Copyright 2009, 2025 IBM Corp., Ian Craggs and others
  *
  * @brief An MQTT client library in C.
  *
@@ -1991,7 +1991,12 @@ exit:
   * of the ::MQTTClient_connectOptions structure override any settings in the environment.
   *
   * If the environment variable PAHO_C_CLIENT_USE_HTTP_PROXY is set to TRUE, then the
-  * http_proxy or https_proxy environment variables are used, for plain TCP and TLS-secured
-  * connections respectively.
+  * http_proxy or https_proxy (lower case only) environment variables are used, for plain
+  * TCP and TLS-secured connections respectively.
+  *
+  * The no_proxy environment variable can be used to exclude certain hosts from using an
+  * environment variable chosen proxy. This does not apply to a proxy selected through the API.
+  * The no_proxy environment variable is lower case only, and is a list of comma-separated
+  * hostname:port values. Suffixes are matched (e.g. example.com will match test.example.com).
   *
   */
diff --git a/src/MQTTProtocolOut.c b/src/MQTTProtocolOut.c
index 5dfde4e9..b53a5e74 100644
--- a/src/MQTTProtocolOut.c
+++ b/src/MQTTProtocolOut.c
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2009, 2024 IBM Corp., Ian Craggs and others
+ * Copyright (c) 2009, 2025 IBM Corp., Ian Craggs and others
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
diff --git a/src/Proxy.c b/src/Proxy.c
index 3322a848..bb9ad682 100644
--- a/src/Proxy.c
+++ b/src/Proxy.c
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2009, 2024 Diehl Metering, Ian Craggs and others
+ * Copyright (c) 2009, 2025 Diehl Metering, Ian Craggs and others
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
diff --git a/src/Proxy.h b/src/Proxy.h
index 116c240f..41d8b94c 100644
--- a/src/Proxy.h
+++ b/src/Proxy.h
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2009, 2024 Diehl Metering, Ian Craggs and others
+ * Copyright (c) 2009, 2025 Diehl Metering, Ian Craggs and others
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
diff --git a/src/Socket.c b/src/Socket.c
index 0abcab6a..ff366578 100644
--- a/src/Socket.c
+++ b/src/Socket.c
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2009, 2023 IBM Corp., Ian Craggs and others
+ * Copyright (c) 2009, 2025 IBM Corp., Ian Craggs and others
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0