diff --git a/include/Gaffer/DependencyNode.h b/include/Gaffer/DependencyNode.h
index dc7a36b4a59..f067f98fac5 100644
--- a/include/Gaffer/DependencyNode.h
+++ b/include/Gaffer/DependencyNode.h
@@ -67,6 +67,9 @@ class DependencyNode : public Node
 		/// for input or to place one in outputs as computations are always performed on the
 		/// leaf level plugs only. Implementations of this method should call the base class
 		/// implementation first.
+		/// \todo Make this protected, and add an accessor on the Plug class instead.
+		/// The general principle in effect elsewhere in Gaffer is that plugs provide
+		/// the public interface to the work done by nodes.
 		virtual void affects( const Plug *input, AffectedPlugsContainer &outputs ) const = 0;
 
 		/// @name Enable/Disable Behaviour
diff --git a/include/GafferArnold/ArnoldDisplacement.h b/include/GafferArnold/ArnoldDisplacement.h
index b5c3201e704..9efc2909a97 100644
--- a/include/GafferArnold/ArnoldDisplacement.h
+++ b/include/GafferArnold/ArnoldDisplacement.h
@@ -79,6 +79,8 @@ class ArnoldDisplacement : public GafferScene::Shader
 		Gaffer::Plug *outPlug();
 		const Gaffer::Plug *outPlug() const;
 
+		virtual void affects( const Gaffer::Plug *input, AffectedPlugsContainer &outputs ) const;
+
 		virtual void attributesHash( IECore::MurmurHash &h ) const;
 		virtual IECore::ConstCompoundObjectPtr attributes() const;
 
diff --git a/python/GafferArnoldTest/ArnoldDisplacementTest.py b/python/GafferArnoldTest/ArnoldDisplacementTest.py
index d88ebcbcf15..f6afc025cf7 100644
--- a/python/GafferArnoldTest/ArnoldDisplacementTest.py
+++ b/python/GafferArnoldTest/ArnoldDisplacementTest.py
@@ -38,7 +38,9 @@
 
 import IECore
 
+import GafferTest
 import GafferSceneTest
+import GafferOSL
 import GafferArnold
 
 class ArnoldDisplacementTest( GafferSceneTest.SceneTestCase ) :
@@ -72,6 +74,45 @@ def test( self ) :
 		d["enabled"].setValue( False )
 		self.assertEqual( d.attributes(), IECore.CompoundObject() )
 
+	def testDirtyPropagation( self ) :
+
+		n = GafferArnold.ArnoldShader()
+		n.loadShader( "noise" )
+
+		d = GafferArnold.ArnoldDisplacement()
+		cs = GafferTest.CapturingSlot( d.plugDirtiedSignal() )
+
+		d["height"].setValue( 10 )
+		self.assertTrue( d["out"] in [ x[0] for x in cs ] )
+
+		del cs[:]
+		d["map"].setInput( n["out"] )
+		self.assertTrue( d["out"] in [ x[0] for x in cs ] )
+
+	def testOSLShaderInput( self ) :
+
+		n = GafferOSL.OSLShader()
+		n.loadShader( "Pattern/Noise" )
+
+		d = GafferArnold.ArnoldDisplacement()
+
+		d["map"].setInput( n["out"] )
+		self.assertTrue( d["map"].getInput().isSame( n["out"] ) )
+
+		na = n.attributes()
+		da = d.attributes()
+
+		self.assertEqual(
+			da,
+			IECore.CompoundObject( {
+				"ai:disp_map" : na["osl:shader"],
+				"ai:disp_height" : IECore.FloatData( 1 ),
+				"ai:disp_padding" : IECore.FloatData( 0 ),
+				"ai:disp_zero_value" : IECore.FloatData( 0 ),
+				"ai:disp_autobump" : IECore.BoolData( False ),
+			} )
+		)
+
 	def testNoInput( self ) :
 
 		d = GafferArnold.ArnoldDisplacement()
diff --git a/src/GafferArnold/ArnoldDisplacement.cpp b/src/GafferArnold/ArnoldDisplacement.cpp
index fc868130feb..6ac878e8517 100644
--- a/src/GafferArnold/ArnoldDisplacement.cpp
+++ b/src/GafferArnold/ArnoldDisplacement.cpp
@@ -45,12 +45,12 @@ using namespace GafferArnold;
 IE_CORE_DEFINERUNTIMETYPED( ArnoldDisplacement );
 
 size_t ArnoldDisplacement::g_firstPlugIndex = 0;
-static IECore::InternedString g_surfaceAttributeName = "ai:surface";
 static IECore::InternedString g_mapAttributeName = "ai:disp_map";
 static IECore::InternedString g_paddingAttributeName = "ai:disp_padding";
 static IECore::InternedString g_heightAttributeName = "ai:disp_height";
 static IECore::InternedString g_zeroValueAttributeName = "ai:disp_zero_value";
 static IECore::InternedString g_autoBumpAttributeName = "ai:disp_autobump";
+static IECore::InternedString g_mapInputAttributeNames[] = { "ai:surface", "osl:shader", "" } ;
 
 ArnoldDisplacement::ArnoldDisplacement( const std::string &name )
 	:	Shader( name )
@@ -128,6 +128,22 @@ const Gaffer::Plug *ArnoldDisplacement::outPlug() const
 	return getChild<Plug>( g_firstPlugIndex + 5 );
 }
 
+void ArnoldDisplacement::affects( const Gaffer::Plug *input, AffectedPlugsContainer &outputs ) const
+{
+	Shader::affects( input, outputs );
+
+	if(
+		input == mapPlug() ||
+		input == heightPlug() ||
+		input == paddingPlug() ||
+		input == zeroValuePlug() ||
+		input == autoBumpPlug()
+	)
+	{
+		outputs.push_back( outPlug() );
+	}
+}
+
 void ArnoldDisplacement::attributesHash( IECore::MurmurHash &h ) const
 {
 	h.append( typeId() );
@@ -153,11 +169,16 @@ IECore::ConstCompoundObjectPtr ArnoldDisplacement::attributes() const
 
 	CompoundObject::ObjectMap &m = result->members();
 	m = mapPlug()->attributes()->members();
-	CompoundObject::ObjectMap::iterator it = m.find( g_surfaceAttributeName );
-	if( it != m.end() )
+
+	for( InternedString *n = g_mapInputAttributeNames; *n != InternedString(); ++n )
 	{
-		m[g_mapAttributeName] = it->second;
-		m.erase( it );
+		CompoundObject::ObjectMap::iterator it = m.find( *n );
+		if( it != m.end() )
+		{
+			m[g_mapAttributeName] = it->second;
+			m.erase( it );
+			break;
+		}
 	}
 
 	m[g_heightAttributeName] = new FloatData( heightPlug()->getValue() );
@@ -184,7 +205,7 @@ bool ArnoldDisplacement::acceptsInput( const Gaffer::Plug *plug, const Gaffer::P
 	{
 		if( const GafferScene::Shader *shader = runTimeCast<const GafferScene::Shader>( inputPlug->source<Plug>()->node() ) )
 		{
-			return runTimeCast<const ArnoldShader>( shader );
+			return runTimeCast<const ArnoldShader>( shader ) || shader->isInstanceOf( "GafferOSL::OSLShader" );
 		}
 	}