diff --git a/src/core/qgscoordinatereferencesystem.cpp b/src/core/qgscoordinatereferencesystem.cpp
index c7496522ddba..540f786351db 100644
--- a/src/core/qgscoordinatereferencesystem.cpp
+++ b/src/core/qgscoordinatereferencesystem.cpp
@@ -1324,13 +1324,13 @@ QString QgsCoordinateReferenceSystem::userFriendlyIdentifier( IdentifierType typ
   else if ( !description().isEmpty() )
     return description();
   else if ( type == ShortString )
-    return QObject::tr( "Unknown CRS" );
+    return isValid() ? QObject::tr( "Custom CRS" ) : QObject::tr( "Unknown CRS" );
   else if ( !toWkt( WKT_PREFERRED ).isEmpty() )
-    return QObject::tr( "Unknown CRS: %1" ).arg(
+    return QObject::tr( "Custom CRS: %1" ).arg(
              type == MediumString ? ( toWkt( WKT_PREFERRED ).left( 50 ) + QString( QChar( 0x2026 ) ) )
              : toWkt( WKT_PREFERRED ) );
   else if ( !toProj().isEmpty() )
-    return QObject::tr( "Unknown CRS: %1" ).arg( type == MediumString ? ( toProj().left( 50 ) + QString( QChar( 0x2026 ) ) )
+    return QObject::tr( "Custom CRS: %1" ).arg( type == MediumString ? ( toProj().left( 50 ) + QString( QChar( 0x2026 ) ) )
            : toProj() );
   else
     return QString();
diff --git a/src/gui/qgsprojectionselectiontreewidget.cpp b/src/gui/qgsprojectionselectiontreewidget.cpp
index 4c77ee1401e9..053e9183b6ec 100644
--- a/src/gui/qgsprojectionselectiontreewidget.cpp
+++ b/src/gui/qgsprojectionselectiontreewidget.cpp
@@ -698,7 +698,7 @@ void QgsProjectionSelectionTreeWidget::loadUnknownCrs( const QgsCoordinateRefere
 {
   if ( !mUnknownList )
   {
-    mUnknownList = new QTreeWidgetItem( lstCoordinateSystems, QStringList( tr( "Unknown Coordinate Systems" ) ) );
+    mUnknownList = new QTreeWidgetItem( lstCoordinateSystems, QStringList( tr( "Custom Coordinate Systems" ) ) );
     QFont fontTemp = mUnknownList->font( 0 );
     fontTemp.setItalic( true );
     fontTemp.setBold( true );
@@ -706,7 +706,7 @@ void QgsProjectionSelectionTreeWidget::loadUnknownCrs( const QgsCoordinateRefere
     mUnknownList->setIcon( 0, QgsApplication::getThemeIcon( QStringLiteral( "/user.svg" ) ) );
   }
 
-  QTreeWidgetItem *newItem = new QTreeWidgetItem( mUnknownList, QStringList( QObject::tr( "Unknown CRS" ) ) );
+  QTreeWidgetItem *newItem = new QTreeWidgetItem( mUnknownList, QStringList( crs.description().isEmpty() ? QObject::tr( "Custom CRS" ) : crs.description() ) );
   newItem->setData( 0, RoleWkt, crs.toWkt( QgsCoordinateReferenceSystem::WKT_PREFERRED ) );
   newItem->setData( 0, RoleProj, crs.toProj() );
 
diff --git a/tests/src/core/testqgscoordinatereferencesystem.cpp b/tests/src/core/testqgscoordinatereferencesystem.cpp
index 1e00524178e8..d2058614c7b7 100644
--- a/tests/src/core/testqgscoordinatereferencesystem.cpp
+++ b/tests/src/core/testqgscoordinatereferencesystem.cpp
@@ -1588,6 +1588,7 @@ void TestQgsCoordinateReferenceSystem::displayIdentifier()
 {
   QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem();
   QCOMPARE( crs.userFriendlyIdentifier(), QString() );
+  QCOMPARE( crs.userFriendlyIdentifier( QgsCoordinateReferenceSystem::ShortString ), QStringLiteral( "Unknown CRS" ) );
   crs = QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:4326" ) );
   QCOMPARE( crs.userFriendlyIdentifier(), QStringLiteral( "EPSG:4326 - WGS 84" ) );
   crs = QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3111" ) );
@@ -1598,12 +1599,13 @@ void TestQgsCoordinateReferenceSystem::displayIdentifier()
   // non registered custom CRS
   crs = QgsCoordinateReferenceSystem::fromProj( QStringLiteral( "+proj=sterea +lat_0=47.9860018439082 +lon_0=19.0491441390302 +k=1 +x_0=500000 +y_0=500000 +ellps=bessel +towgs84=595.75,121.09,515.50,8.2270,-1.5193,5.5971,-2.6729 +units=m +vunits=m +no_defs" ) );
 #if PROJ_VERSION_MAJOR>=6
-  QCOMPARE( crs.userFriendlyIdentifier(), QStringLiteral( "Unknown CRS: BOUNDCRS[SOURCECRS[COMPOUNDCRS[\"unknown\",PROJCRS[\"%1" ).arg( QString( QChar( 0x2026 ) ) ) );  //#spellok
-  QCOMPARE( crs.userFriendlyIdentifier( QgsCoordinateReferenceSystem::FullString ), QStringLiteral( R"""(Unknown CRS: BOUNDCRS[SOURCECRS[COMPOUNDCRS["unknown",PROJCRS["unknown",BASEGEOGCRS["unknown",DATUM["Unknown based on Bessel 1841 ellipsoid",ELLIPSOID["Bessel 1841",6377397.155,299.1528128,LENGTHUNIT["metre",1,ID["EPSG",9001]]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8901]]],CONVERSION["unknown",METHOD["Oblique Stereographic",ID["EPSG",9809]],PARAMETER["Latitude of natural origin",47.9860018439082,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude of natural origin",19.0491441390302,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale factor at natural origin",1,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False easting",500000,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False northing",500000,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["(E)",east,ORDER[1],LENGTHUNIT["metre",1,ID["EPSG",9001]]],AXIS["(N)",north,ORDER[2],LENGTHUNIT["metre",1,ID["EPSG",9001]]]],VERTCRS["unknown",VDATUM["unknown"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["metre",1,ID["EPSG",9001]]]]]],TARGETCRS[GEOGCRS["WGS 84",DATUM["World Geodetic System 1984",ELLIPSOID["WGS 84",6378137,298.257223563,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],CS[ellipsoidal,2],AXIS["latitude",north,ORDER[1],ANGLEUNIT["degree",0.0174532925199433]],AXIS["longitude",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4326]]],ABRIDGEDTRANSFORMATION["Transformation from unknown to WGS84",METHOD["Position Vector transformation (geog2D domain)",ID["EPSG",9606]],PARAMETER["X-axis translation",595.75,ID["EPSG",8605]],PARAMETER["Y-axis translation",121.09,ID["EPSG",8606]],PARAMETER["Z-axis translation",515.5,ID["EPSG",8607]],PARAMETER["X-axis rotation",8.227,ID["EPSG",8608]],PARAMETER["Y-axis rotation",-1.5193,ID["EPSG",8609]],PARAMETER["Z-axis rotation",5.5971,ID["EPSG",8610]],PARAMETER["Scale difference",0.9999973271,ID["EPSG",8611]]]])""" ) );
+  QCOMPARE( crs.userFriendlyIdentifier(), QStringLiteral( "Custom CRS: BOUNDCRS[SOURCECRS[COMPOUNDCRS[\"unknown\",PROJCRS[\"%1" ).arg( QString( QChar( 0x2026 ) ) ) );  //#spellok
+  QCOMPARE( crs.userFriendlyIdentifier( QgsCoordinateReferenceSystem::FullString ), QStringLiteral( R"""(Custom CRS: BOUNDCRS[SOURCECRS[COMPOUNDCRS["unknown",PROJCRS["unknown",BASEGEOGCRS["unknown",DATUM["Unknown based on Bessel 1841 ellipsoid",ELLIPSOID["Bessel 1841",6377397.155,299.1528128,LENGTHUNIT["metre",1,ID["EPSG",9001]]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8901]]],CONVERSION["unknown",METHOD["Oblique Stereographic",ID["EPSG",9809]],PARAMETER["Latitude of natural origin",47.9860018439082,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude of natural origin",19.0491441390302,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale factor at natural origin",1,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False easting",500000,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False northing",500000,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["(E)",east,ORDER[1],LENGTHUNIT["metre",1,ID["EPSG",9001]]],AXIS["(N)",north,ORDER[2],LENGTHUNIT["metre",1,ID["EPSG",9001]]]],VERTCRS["unknown",VDATUM["unknown"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["metre",1,ID["EPSG",9001]]]]]],TARGETCRS[GEOGCRS["WGS 84",DATUM["World Geodetic System 1984",ELLIPSOID["WGS 84",6378137,298.257223563,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],CS[ellipsoidal,2],AXIS["latitude",north,ORDER[1],ANGLEUNIT["degree",0.0174532925199433]],AXIS["longitude",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4326]]],ABRIDGEDTRANSFORMATION["Transformation from unknown to WGS84",METHOD["Position Vector transformation (geog2D domain)",ID["EPSG",9606]],PARAMETER["X-axis translation",595.75,ID["EPSG",8605]],PARAMETER["Y-axis translation",121.09,ID["EPSG",8606]],PARAMETER["Z-axis translation",515.5,ID["EPSG",8607]],PARAMETER["X-axis rotation",8.227,ID["EPSG",8608]],PARAMETER["Y-axis rotation",-1.5193,ID["EPSG",8609]],PARAMETER["Z-axis rotation",5.5971,ID["EPSG",8610]],PARAMETER["Scale difference",0.9999973271,ID["EPSG",8611]]]])""" ) );
 #else
-  QCOMPARE( crs.userFriendlyIdentifier(), QStringLiteral( "Unknown CRS: PROJCS[\"unnamed\",GEOGCS[\"Bessel 1841\",DATUM[\"unkno%1" ).arg( QString( QChar( 0x2026 ) ) ) );
+  QCOMPARE( crs.userFriendlyIdentifier(), QStringLiteral( "Custom CRS: PROJCS[\"unnamed\",GEOGCS[\"Bessel 1841\",DATUM[\"unkno%1" ).arg( QString( QChar( 0x2026 ) ) ) );
 #endif
-  QCOMPARE( crs.userFriendlyIdentifier( QgsCoordinateReferenceSystem::ShortString ), QStringLiteral( "Unknown CRS" ) );
+  QCOMPARE( crs.userFriendlyIdentifier( QgsCoordinateReferenceSystem::ShortString ), QStringLiteral( "Custom CRS" ) );
+
   crs.saveAsUserCrs( QStringLiteral( "my test" ) );
 #if PROJ_VERSION_MAJOR>=6
   QCOMPARE( crs.userFriendlyIdentifier(), QStringLiteral( "USER:100011 - my test" ) );