1 files changed, 3 insertions, 0 deletions
diff --git a/src/proj.h b/src/proj.h
index 330ab01e..2acaab82 100644
--- a/src/proj.h
+++ b/src/proj.h
@@ -710,6 +710,9 @@ typedef enum
     PJ_TYPE_VERTICAL_REFERENCE_FRAME,
     PJ_TYPE_DYNAMIC_VERTICAL_REFERENCE_FRAME,
     PJ_TYPE_DATUM_ENSEMBLE,
+    PJ_TYPE_TEMPORAL_DATUM,
+    PJ_TYPE_ENGINEERING_DATUM,
+    PJ_TYPE_PARAMETRIC_DATUM,
 
     /** Abstract type, not returned by proj_get_type() */
     PJ_TYPE_CRS,