diff --git a/libguac/include/client-handlers.h b/libguac/include/client-handlers.h
index 7db42e6f..cb1ddca4 100644
--- a/libguac/include/client-handlers.h
+++ b/libguac/include/client-handlers.h
@@ -99,6 +99,27 @@ int __guac_handle_key(guac_client* client, guac_instruction* instruction);
  */
 int __guac_handle_clipboard(guac_client* client, guac_instruction* instruction);
 
+/**
+ * Internal initial handler for the size instruction. When a size instruction
+ * is received, this handler will be called. The client's size handler will
+ * be invoked if defined.
+ */
+int __guac_handle_size(guac_client* client, guac_instruction* instruction);
+
+/**
+ * Internal initial handler for the video instruction. When a video instruction
+ * is received, this handler will be called. The client's video handler will
+ * be invoked if defined.
+ */
+int __guac_handle_video(guac_client* client, guac_instruction* instruction);
+
+/**
+ * Internal initial handler for the audio instruction. When a audio instruction
+ * is received, this handler will be called. The client's audio handler will
+ * be invoked if defined.
+ */
+int __guac_handle_audio(guac_client* client, guac_instruction* instruction);
+
 /**
  * Internal initial handler for the disconnect instruction. When a disconnect instruction
  * is received, this handler will be called. Disconnect instructions are automatically
diff --git a/libguac/include/client.h b/libguac/include/client.h
index d0255c28..3b52fa42 100644
--- a/libguac/include/client.h
+++ b/libguac/include/client.h
@@ -77,6 +77,22 @@ typedef int guac_client_key_handler(guac_client* client, int keysym, int pressed
  */
 typedef int guac_client_clipboard_handler(guac_client* client, char* copied);
 
+/**
+ * Handler for Guacamole screen size events.
+ */
+typedef int guac_client_size_handler(guac_client* client,
+        int width, int height);
+
+/**
+ * Handler for Guacamole audio format events.
+ */
+typedef int guac_client_audio_handler(guac_client* client, char* mimetype);
+
+/**
+ * Handler for Guacamole video format events.
+ */
+typedef int guac_client_video_handler(guac_client* client, char* mimetype);
+
 /**
  * Handler for freeing up any extra data allocated by the client
  * implementation.
@@ -280,6 +296,57 @@ struct guac_client {
      */
     guac_client_clipboard_handler* clipboard_handler;
 
+    /**
+     * Handler for size events sent by the Guacamole web-client.
+     *
+     * The handler takes an integer width and integer height, representing
+     * the current visible screen area of the client.
+     *
+     * Example:
+     * @code
+     *     int size_handler(guac_client* client, int width, int height);
+     *
+     *     int guac_client_init(guac_client* client, int argc, char** argv) {
+     *         client->size_handler = size_handler;
+     *     }
+     * @endcode
+     */
+    guac_client_size_handler* size_handler;
+
+    /**
+     * Handler for audio format events sent by the Guacamole web-client.
+     *
+     * The handler takes the mimetype of the audio format being advertised
+     * as supported by the client.
+     *
+     * Example:
+     * @code
+     *     int audio_handler(guac_client* client, char* mimetype);
+     *
+     *     int guac_client_init(guac_client* client, int argc, char** argv) {
+     *         client->audio_handler = audio_handler;
+     *     }
+     * @endcode
+     */
+    guac_client_audio_handler* audio_handler;
+
+    /**
+     * Handler for video format events sent by the Guacamole web-client.
+     *
+     * The handler takes the mimetype of the video format being advertised
+     * as supported by the client.
+     *
+     * Example:
+     * @code
+     *     int video_handler(guac_client* client, char* mimetype);
+     *
+     *     int guac_client_init(guac_client* client, int argc, char** argv) {
+     *         client->video_handler = video_handler;
+     *     }
+     * @endcode
+     */
+    guac_client_video_handler* video_handler;
+
     /**
      * Handler for freeing data when the client is being unloaded.
      *
diff --git a/libguac/src/client-handlers.c b/libguac/src/client-handlers.c
index a6a144f3..494081ad 100644
--- a/libguac/src/client-handlers.c
+++ b/libguac/src/client-handlers.c
@@ -50,6 +50,9 @@ __guac_instruction_handler_mapping __guac_instruction_handler_map[] = {
    {"key",        __guac_handle_key},
    {"clipboard",  __guac_handle_clipboard},
    {"disconnect", __guac_handle_disconnect},
+   {"size",       __guac_handle_size},
+   {"audio",      __guac_handle_audio},
+   {"video",      __guac_handle_video},
    {NULL,         NULL}
 };
 
@@ -115,6 +118,34 @@ int __guac_handle_clipboard(guac_client* client, guac_instruction* instruction)
     return 0;
 }
 
+int __guac_handle_size(guac_client* client, guac_instruction* instruction) {
+    if (client->size_handler)
+        return client->size_handler(
+            client,
+            atoi(instruction->argv[0]), /* width */
+            atoi(instruction->argv[1])  /* height */
+        );
+    return 0;
+}
+
+int __guac_handle_video(guac_client* client, guac_instruction* instruction) {
+    if (client->video_handler)
+        return client->video_handler(
+            client,
+            instruction->argv[0] /* mimetype */
+        );
+    return 0;
+}
+
+int __guac_handle_audio(guac_client* client, guac_instruction* instruction) {
+    if (client->audio_handler)
+        return client->audio_handler(
+            client,
+            instruction->argv[0] /* mimetype */
+        );
+    return 0;
+}
+
 int __guac_handle_disconnect(guac_client* client, guac_instruction* instruction) {
     /* Return error code to force disconnect */
     return -1;