diff --git a/src/gswe-moment.h b/src/gswe-moment.h
index b29fb6d..2af90fe 100644
--- a/src/gswe-moment.h
+++ b/src/gswe-moment.h
@@ -19,8 +19,20 @@ typedef struct _GsweMomentPrivate GsweMomentPrivate;
 #define GSWE_MOMENT_ERROR gswe_moment_error_quark()
 GQuark gswe_moment_error_quark(void);
 
-/*
+/**
  * GsweMomentError:
+ * @GSWE_MOMENT_ERROR_SUCCESS: no error
+ * @GSWE_MOMENT_ERROR_UNKNOWN_HSYS: house system provided is unknown (a
+ *                                  #GsweHouseSystem value must be passed)
+ * @GSWE_MOMENT_ERROR_UNKNOWN_SIGN: an unknown zodiac sign is calculated
+ * @GSWE_MOMENT_ERROR_NONADDED_PLANET: the referenced planet is not added to
+ *                                     the GsweMoment object
+ * @GSWE_MOMENT_ERROR_SWE_ERROR_NONFATAL: an error reported by the Swiss
+ *                                        Ephemeris library. Errors marked with
+ *                                        this value are not fatal, so it's
+ *                                        more like a warning
+ * @GSWE_MOMENT_ERROR_SWE_ERROR_FATAL: a fatal error reported by the Swiss
+ *                                     Ephemeris library
  *
  * Error values for GsweTimestamp initialization
  */
diff --git a/src/gswe-timestamp.h b/src/gswe-timestamp.h
index 4f469d6..6d6ab8d 100644
--- a/src/gswe-timestamp.h
+++ b/src/gswe-timestamp.h
@@ -19,12 +19,19 @@ GQuark gswe_timestamp_error_quark(void);
 
 /**
  * GsweTimestampError:
+ * @GSWE_TIMESTAMP_ERROR_SUCCESS: no error
  * @GSWE_TIMESTAMP_ERROR_INVALID_DATE: the Gregorian date specified in this
- *                                     #GsweTimestamp is invalid
+ *                                     GsweTimestamp is invalid
  * @GSWE_TIMESTAMP_ERROR_INVALID_TIME: the time specified in this
- *                                     #GsweTimestamp is invalid
+ *                                     GsweTimestamp is invalid
+ * @GSWE_TIMESTAMP_ERROR_NO_VALID: the GsweTimestamp object holds no valid
+ *                                 timestamp
+ * @GSWE_TIMESTAMP_ERROR_SWE_ERROR: denotes an error detected by the Swiss
+ *                                  Ephemeris library, converted from their
+ *                                  static char array to a #GError
  */
 typedef enum {
+    GSWE_TIMESTAMP_ERROR_SUCCESS,
     GSWE_TIMESTAMP_ERROR_INVALID_DATE,
     GSWE_TIMESTAMP_ERROR_INVALID_TIME,
     GSWE_TIMESTAMP_ERROR_NO_VALID,