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-rw-r--r--src/iso19111/c_api.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/iso19111/c_api.cpp b/src/iso19111/c_api.cpp
index 7341131f..f3badb51 100644
--- a/src/iso19111/c_api.cpp
+++ b/src/iso19111/c_api.cpp
@@ -2965,6 +2965,9 @@ PJ *proj_create_vertical_crs(PJ_CONTEXT *ctx, const char *crs_name,
* use.
* It should be used by at most one thread at a time.
*
+ * This is an extented (_ex) version of proj_create_vertical_crs() that adds
+ * the capability of defining a geoid model.
+ *
* @param ctx PROJ context, or NULL for default context
* @param crs_name Name of the GeographicCRS. Or NULL
* @param datum_name Name of the VerticalReferenceFrame. Or NULL