1 files changed, 4 insertions, 0 deletions
diff --git a/src/proj.h b/src/proj.h
index b60d7f66..550d422d 100644
--- a/src/proj.h
+++ b/src/proj.h
@@ -735,6 +735,10 @@ typedef enum
     PJ_TYPE_TRANSFORMATION,
     PJ_TYPE_CONCATENATED_OPERATION,
     PJ_TYPE_OTHER_COORDINATE_OPERATION,
+
+    PJ_TYPE_TEMPORAL_DATUM,
+    PJ_TYPE_ENGINEERING_DATUM,
+    PJ_TYPE_PARAMETRIC_DATUM,
 } PJ_TYPE;
 
 /** Comparison criterion. */