From 3121d9bc309b439adcc2ab9743a3d2b3a8f48296 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Thu, 17 Jan 2019 10:40:12 +0100
Subject: import/export PROJ strings from ISO19111 code: require/output
 +type=crs for CRS objects (refs #1214)

---
 include/proj/io.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'include')

diff --git a/include/proj/io.hpp b/include/proj/io.hpp
index 7f7639cd..813b4bdb 100644
--- a/include/proj/io.hpp
+++ b/include/proj/io.hpp
@@ -526,7 +526,9 @@ class PROJ_GCC_DLL IPROJStringExportable {
      *
      * <li>For PROJStringFormatter::Convention::PROJ_4, format a string
      * compatible with the OGRSpatialReference::exportToProj4() of GDAL
-     * &lt;=2.3.
+     * &lt;=2.3. It is only compatible of a few CRS objects. The PROJ string
+     * will also contain a +type=crs parameter to disambiguish the nature of
+     * the string from a CoordinateOperation.
      * <ul>
      * <li>For a crs::GeographicCRS, returns a proj=longlat string, with
      * ellipsoid / datum / prime meridian information, ignoring axis order
-- 
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