diff --git a/xsd/netex_framework/netex_utility/netex_utility_types.xsd b/xsd/netex_framework/netex_utility/netex_utility_types.xsd
index 24ae66550..4d8887755 100644
--- a/xsd/netex_framework/netex_utility/netex_utility_types.xsd
+++ b/xsd/netex_framework/netex_utility/netex_utility_types.xsd
@@ -281,7 +281,7 @@ Rail transport, Roads and Road transport
 			</xsd:element>
 			<xsd:element name="TextColour" type="ColourValueType" minOccurs="0">
 				<xsd:annotation>
-					<xsd:documentation>Default colour value for text associated with ENTITY.</xsd:documentation>
+					<xsd:documentation>Default RGB colour value for text associated with ENTITY.</xsd:documentation>
 				</xsd:annotation>
 			</xsd:element>
 			<xsd:element name="TextColourName" type="xsd:normalizedString" minOccurs="0">
@@ -332,7 +332,7 @@ Rail transport, Roads and Road transport
 		<xsd:sequence>
 			<xsd:element name="Colour" type="PrintColourValueType" minOccurs="0">
 				<xsd:annotation>
-					<xsd:documentation>Default colour value for printed  graphics associated with ENTITY - e.g. of a LINE, e.g. CMYK.</xsd:documentation>
+					<xsd:documentation>Default colour value for printed graphics associated with ENTITY - e.g. of a LINE. This may be, e.g., a CMYK or RAL code, not intended to be machine-readable.</xsd:documentation>
 				</xsd:annotation>
 			</xsd:element>
 			<xsd:element name="ColourName" type="xsd:normalizedString" minOccurs="0">
@@ -348,9 +348,9 @@ Rail transport, Roads and Road transport
 					- Pantone (be aware that Pantone is proprietary), etc.</xsd:documentation>
 				</xsd:annotation>
 			</xsd:element>
-			<xsd:element name="BackgroundColour" type="ColourValueType" minOccurs="0">
+			<xsd:element name="BackgroundColour" type="PrintColourValueType" minOccurs="0">
 				<xsd:annotation>
-					<xsd:documentation>Default RGB background colour value for printed text and graphics associated with ENTITY - e.g. of a LINE.</xsd:documentation>
+					<xsd:documentation>Default background colour value for printed text and graphics associated with ENTITY. This may be, e.g., a CMYK or RAL code, not intended to be machine-readable.</xsd:documentation>
 				</xsd:annotation>
 			</xsd:element>
 			<xsd:element name="BackgroundColourName" type="xsd:normalizedString" minOccurs="0">
@@ -360,7 +360,7 @@ Rail transport, Roads and Road transport
 			</xsd:element>
 			<xsd:element name="TextColour" type="PrintColourValueType" minOccurs="0">
 				<xsd:annotation>
-					<xsd:documentation>Default colour value for printed text associated with entity. CMYK.</xsd:documentation>
+					<xsd:documentation>Default colour value for printed text associated with entity. This may be, e.g., a CMYK or RAL code, not intended to be machine-readable.</xsd:documentation>
 				</xsd:annotation>
 			</xsd:element>
 			<xsd:element name="TextColourName" type="xsd:normalizedString" minOccurs="0">