diff --git a/src/gswe-timestamp.c b/src/gswe-timestamp.c
index 7f53e24..abb4224 100644
--- a/src/gswe-timestamp.c
+++ b/src/gswe-timestamp.c
@@ -1205,6 +1205,8 @@ gswe_timestamp_get_julian_day_et(GsweTimestamp *timestamp, GError **err)
  * be in Universal Time (UT). For Ephemeris time, see
  * gswe_timestamp_set_julian_day(). Should an error occur, @err is populated
  * with the error details.
+ *
+ * Since: 2.1
  */
 void
 gswe_timestamp_set_julian_day_ut(
@@ -1256,6 +1258,8 @@ gswe_timestamp_set_julian_day_ut(
  * Gets the Julian day value of @timestamp, Universal Time (UT). For Ephemeris
  * Time (ET) see gswe_timestamp_get_julian_day_et(). @err is populated if the
  * calculations raise an error.
+ *
+ * Since: 2.1
  */
 gdouble
 gswe_timestamp_get_julian_day_ut(GsweTimestamp *timestamp, GError **err)
diff --git a/src/gswe-version.c b/src/gswe-version.c
index 4c877b0..15e0b30 100644
--- a/src/gswe-version.c
+++ b/src/gswe-version.c
@@ -33,18 +33,24 @@
  * GSWE_MAJOR_VERSION:
  *
  * The major version number of the SWE-GLib library.
+ *
+ * Since: 2.1
  */
 
 /**
  * GSWE_MINOR_VERSION:
  *
  * The minor version number of the SWE-GLib library.
+ *
+ * Since: 2.1
  */
 
 /**
  * GSWE_MICRO_VERSION:
  *
  * The micro version number of the SWE-GLib library.
+ *
+ * Since: 2.1
  */
 
 /**
@@ -57,6 +63,8 @@
  * against.
  *
  * Returns: TRUE if the required version is satisfied; FALSE otherwise.
+ *
+ * Since: 2.1
  */
 
 /**
@@ -69,6 +77,8 @@
  * version.
  *
  * Returns: TRUE if the required version is satisfied; FALSE otherwise.
+ *
+ * Since: 2.1
  */
 gboolean
 gswe_check_version(
diff --git a/src/swe-glib.c b/src/swe-glib.c
index cd6fafb..cd1c3dd 100644
--- a/src/swe-glib.c
+++ b/src/swe-glib.c
@@ -665,6 +665,8 @@ gswe_init(void)
  * @err: a GError
  *
  * Find the #GswePlanetInfo record registered with the id @planet.
+ *
+ * Since: 2.1
  */
 GswePlanetInfo *
 gswe_find_planet_info_by_id(GswePlanet planet, GError **err)
@@ -691,6 +693,8 @@ gswe_find_planet_info_by_id(GswePlanet planet, GError **err)
  * @err: a GError
  *
  * Find the #GsweSignInfo record registered with the id @sign.
+ *
+ * Since: 2.1
  */
 GsweSignInfo *
 gswe_find_sign_info_by_id(GsweZodiac sign, GError **err)
@@ -717,6 +721,8 @@ gswe_find_sign_info_by_id(GsweZodiac sign, GError **err)
  * @err: a GError
  *
  * Find the #GsweHouseSystemInfo record registered with the id @house_system.
+ *
+ * Since: 2.1
  */
 GsweHouseSystemInfo *
 gswe_find_house_system_info_by_id(GsweHouseSystem house_system, GError **err)
@@ -743,6 +749,8 @@ gswe_find_house_system_info_by_id(GsweHouseSystem house_system, GError **err)
  * @err: a GError
  *
  * Find the #GsweAspectInfo record registered with the id @aspect.
+ *
+ * Since: 2.1
  */
 GsweAspectInfo *
 gswe_find_aspect_info_by_id(GsweAspect aspect, GError **err)
@@ -770,6 +778,8 @@ gswe_find_aspect_info_by_id(GsweAspect aspect, GError **err)
  *
  * Find the #GsweAntiscionAxisInfo record registered with the id
  * @antiscion_axis.
+ *
+ * Since: 2.1
  */
 GsweAntiscionAxisInfo *
 gswe_find_antiscion_axis_info_by_id(