diff --git a/GeoLib/IO/XmlIO/Boost/BoostXmlGmlInterface.cpp b/GeoLib/IO/XmlIO/Boost/BoostXmlGmlInterface.cpp
index 6ce739ce342728a86f454fd0663b5ca45baeb472..e85a2a7f2dcd770f0ee6e80ea2879884ca946899 100644
--- a/GeoLib/IO/XmlIO/Boost/BoostXmlGmlInterface.cpp
+++ b/GeoLib/IO/XmlIO/Boost/BoostXmlGmlInterface.cpp
@@ -194,6 +194,9 @@ void BoostXmlGmlInterface::readPolylines(
         {
             // polyline has no name, ignore it.
             pl.ignoreConfigParameterAll("pnt");
+            WARN(
+                "Polyline name is required! Polylines without a name are "
+                "ignored.");
         }
     }
 }