diff --git a/src/opustags.cc b/src/opustags.cc
index 1427508..ffb8a10 100644
--- a/src/opustags.cc
+++ b/src/opustags.cc
@@ -1,5 +1,7 @@
 #include <config.h>
 
+#include "opustags.h"
+
 #include <errno.h>
 #include <getopt.h>
 #include <limits.h>
@@ -15,13 +17,7 @@
 #define le32toh(x) OSSwapLittleToHostInt32(x)
 #endif
 
-typedef struct {
-    uint32_t vendor_length;
-    const char *vendor_string;
-    uint32_t count;
-    uint32_t *lengths;
-    const char **comment;
-} opus_tags;
+using namespace ot;
 
 int parse_tags(char *data, long len, opus_tags *tags){
     long pos;
diff --git a/src/opustags.h b/src/opustags.h
new file mode 100644
index 0000000..de7fbb3
--- /dev/null
+++ b/src/opustags.h
@@ -0,0 +1,32 @@
+/**
+ * \file src/opustags.h
+ * \brief Interface of all the submodules of opustags.
+ */
+
+#include <cstdint>
+
+namespace ot {
+
+/**
+ * \defgroup ogg Ogg
+ * \brief Helpers to work with libogg.
+ */
+
+/**
+ * \defgroup opus Opus
+ * \brief Opus packet decoding and recoding.
+ *
+ * \{
+ */
+
+struct opus_tags {
+	uint32_t vendor_length;
+	const char *vendor_string;
+	uint32_t count;
+	uint32_t *lengths;
+	const char **comment;
+};
+
+/** \} */
+
+}