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diff --git a/src/readwrite.h b/src/readwrite.h
index eeead6b..a0c8dba 100644
--- a/src/readwrite.h
+++ b/src/readwrite.h
@@ -1,12 +1,22 @@
+/* readwrite.h:
+ *
+ * Routines for reading/writing multibyte data from/to files. They ensure a
+ * defined endianness.
+ */
+
 #ifndef READWRITE_H
 #define READWRITE_H
 
-#include <stdio.h>
-#include <stdint.h>
 
-uint16_t read_uint16_bigendian(FILE * file);
-void write_uint16_bigendian(uint16_t x, FILE * file);
-uint32_t read_uint32_bigendian(FILE * file);
-void write_uint32_bigendian(uint32_t x, FILE * file);
+
+#include <stdio.h> /* for FILE typedef */
+#include <stdint.h> /* for uint16_t, uint32_t */
+
+
+
+extern uint16_t read_uint16_bigendian(FILE * file);
+extern uint32_t read_uint32_bigendian(FILE * file);
+extern void write_uint16_bigendian(uint16_t x, FILE * file);
+extern void write_uint32_bigendian(uint32_t x, FILE * file);
 
 #endif