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diff --git a/uip/apps/hello-world/hello-world.h b/uip/apps/hello-world/hello-world.h
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+++ b/uip/apps/hello-world/hello-world.h
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+/**
+ * \addtogroup apps
+ * @{
+ */
+
+/**
+ * \defgroup helloworld Hello, world
+ * @{
+ *
+ * A small example showing how to write applications with
+ * \ref psock "protosockets".
+ */
+
+/**
+ * \file
+ *         Header file for an example of how to write uIP applications
+ *         with protosockets.
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#ifndef __HELLO_WORLD_H__
+#define __HELLO_WORLD_H__
+
+/* Since this file will be included by uip.h, we cannot include uip.h
+   here. But we might need to include uipopt.h if we need the u8_t and
+   u16_t datatypes. */
+#include "uipopt.h"
+
+#include "psock.h"
+
+/* Next, we define the uip_tcp_appstate_t datatype. This is the state
+   of our application, and the memory required for this state is
+   allocated together with each TCP connection. One application state
+   for each TCP connection. */
+typedef struct hello_world_state {
+  struct psock p;
+  char inputbuffer[10];
+  char name[40];
+} uip_tcp_appstate_t;
+
+/* Finally we define the application function to be called by uIP. */
+void hello_world_appcall(void);
+#ifndef UIP_APPCALL
+#define UIP_APPCALL hello_world_appcall
+#endif /* UIP_APPCALL */
+
+void hello_world_init(void);
+
+#endif /* __HELLO_WORLD_H__ */
+/** @} */
+/** @} */