add function comments

client_handler.h

@@ -11,6 +11,19 @@
 #include <sys/time.h>
 #include <sys/types.h>
 
+/**
+ * Handles a single client connection. Meant to be run in a separate thread.
+ *
+ * @param args A pointer to the file descriptor of the client
+ *
+ * @return NULL
+ *
+ * @details
+ * This function is designed to be run in a separate thread. It will receive
+ * requests from the client until the client disconnects, at which point it will
+ * return. Reading the requests and building responses is handled by
+ * handle_request.
+ */
 void* client_handler(void* args);
 
 #endif