-extern int bt_version_get_major(void);
-extern int bt_version_get_minor(void);
-extern int bt_version_get_patch(void);
+/*!
+@defgroup api-version Library version
+
+@brief
+ Library version getters.
+
+This module contains four functions to get the four parts of the
+library's version:
+
+<dl>
+ <dt>Major version</dt>
+ <dd>bt_version_get_major()</dd>
+
+ <dt>Minor version</dt>
+ <dd>bt_version_get_minor()</dd>
+
+ <dt>Patch version</dt>
+ <dd>bt_version_get_patch()</dd>
+
+ <dt>Extra information</dt>
+ <dd>bt_version_get_extra()</dd>
+</dl>
+*/
+
+/*! @{ */
+
+/*!
+@brief
+ Returns the major version of libbabeltrace2.
+
+@returns
+ Major version of the library.
+*/
+extern unsigned int bt_version_get_major(void);
+
+/*!
+@brief
+ Returns the minor version of libbabeltrace2.
+
+@returns
+ Minor version of the library.
+*/
+extern unsigned int bt_version_get_minor(void);
+
+/*!
+@brief
+ Returns the patch version of libbabeltrace2.
+
+@returns
+ Patch version of the library.
+*/
+extern unsigned int bt_version_get_patch(void);
+
+/*!
+@brief
+ Returns extra information about the version of libbabeltrace2.
+
+This extra information can contain a version suffix such as
+<code>-pre5</code> or <code>-rc1</code>.
+
+@returns
+ Extra information about the library's version, or \c NULL if none.
+*/