diff --git a/core/org.eclipse.cdt.core.tests/model/org/eclipse/cdt/core/settings/model/CProjectDescriptionDeltaTests.java b/core/org.eclipse.cdt.core.tests/model/org/eclipse/cdt/core/settings/model/CProjectDescriptionDeltaTests.java
index ff562be920b..4d80b3adff7 100644
--- a/core/org.eclipse.cdt.core.tests/model/org/eclipse/cdt/core/settings/model/CProjectDescriptionDeltaTests.java
+++ b/core/org.eclipse.cdt.core.tests/model/org/eclipse/cdt/core/settings/model/CProjectDescriptionDeltaTests.java
@@ -19,6 +19,8 @@ import java.util.Map;
 import junit.framework.TestSuite;
 
 import org.eclipse.cdt.core.CCorePlugin;
+import org.eclipse.cdt.core.language.settings.providers.ILanguageSettingsProvider;
+import org.eclipse.cdt.core.language.settings.providers.LanguageSettingsSerializable;
 import org.eclipse.cdt.core.model.CoreModel;
 import org.eclipse.cdt.core.settings.model.util.CDataUtil;
 import org.eclipse.cdt.core.testplugin.ResourceHelper;
@@ -994,5 +996,52 @@ public class CProjectDescriptionDeltaTests  extends BaseTestCase{
 		ICProjectDescription newSetting = (ICProjectDescription)delta.getNewSetting();
 		assertEquals(cfgDescription1.getName(), newSetting.getDefaultSettingConfiguration().getName());
 	}
+	
+	public void testDelta_LANGUAGE_SETTINGS_PROVIDERS() throws Exception {
+		String projName = getName();
+		ICProjectDescriptionManager mngr = CoreModel.getDefault().getProjectDescriptionManager();
+		
+		initListener(projName);
+		IProject project = ResourceHelper.createCDTProjectWithConfig(projName);
+		
+		// Get writable project description and its configuration
+		ICProjectDescription prjDescription = mngr.getProjectDescription(project, true);
+		assertNotNull(prjDescription);
+		ICConfigurationDescription cfgDescription = prjDescription.getConfigurations()[0];
+		assertNotNull(cfgDescription);
+		List<ILanguageSettingsProvider> originalProviders = cfgDescription.getLanguageSettingProviders();
+		
+		// Modification LANGUAGE_SETTINGS_PROVIDERS
+		ILanguageSettingsProvider provider = new LanguageSettingsSerializable("id", "name");
+		List<ILanguageSettingsProvider> providers = new ArrayList<ILanguageSettingsProvider>();
+		providers.add(provider);
+		cfgDescription.setLanguageSettingProviders(providers);
+		
+		// Write project description
+		listener.clearNotified();
+		mngr.setProjectDescription(project, prjDescription);
+		assertEquals(true, listener.isNotified());
+		
+		// Analyze delta
+		ICDescriptionDelta rootDelta = listener.getDelta();
+		assertNotNull(rootDelta);
+		List<ICDescriptionDelta> deltas = findDeltas(rootDelta, ICDescriptionDelta.LANGUAGE_SETTINGS_PROVIDERS);
+		assertEquals(1, deltas.size());
+		ICDescriptionDelta delta = deltas.get(0);
+		assertNotNull(delta);
+		assertEquals(ICDescriptionDelta.LANGUAGE_SETTINGS_PROVIDERS, delta.getChangeFlags());
+		
+		// Check old setting
+		assertTrue(delta.getOldSetting() instanceof ICConfigurationDescription);
+		ICConfigurationDescription oldSetting = (ICConfigurationDescription)delta.getOldSetting();
+		List<ILanguageSettingsProvider> oldProviders = oldSetting.getLanguageSettingProviders();
+		assertEquals(originalProviders, oldProviders);
+		
+		// Check new setting
+		assertTrue(delta.getNewSetting() instanceof ICConfigurationDescription);
+		ICConfigurationDescription newSetting = (ICConfigurationDescription)delta.getNewSetting();
+		List<ILanguageSettingsProvider> newProviders = newSetting.getLanguageSettingProviders();
+		assertEquals(providers, newProviders);
+	}
 
 }
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICDescriptionDelta.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICDescriptionDelta.java
index 8467c6966c9..11172d5d99d 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICDescriptionDelta.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/settings/model/ICDescriptionDelta.java
@@ -49,7 +49,10 @@ public interface ICDescriptionDelta {
 //	int PATH = 1 << 3;
 	int LANGUAGE_ID = 1 << 4;
 	int SOURCE_CONTENT_TYPE = 1 << 5;
-	int SOURCE_ENTENSIONS = 1 << 6;
+	int SOURCE_EXTENSIONS = 1 << 6;
+	/** @deprecated Use ICDescriptionDelta.SOURCE_EXTENSIONS */
+	@Deprecated
+	int SOURCE_ENTENSIONS = SOURCE_EXTENSIONS;
 //	int HEADER_CONTENT_TYPE = 1 << 7;
 //	int HEADER_ENTENSIONS = 1 << 8;
 	int SETTING_ENTRIES = 1 << 9;
@@ -66,6 +69,7 @@ public interface ICDescriptionDelta {
 	int OWNER = 1 << 20;
 	int INDEX_CFG = 1 << 21;
 	int SETTING_CFG = INDEX_CFG;
+	int LANGUAGE_SETTINGS_PROVIDERS = 1 << 22;
 	
 	/**
 	 * specifies that the project "isCdtProjectCreating" state was set to false
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionDelta.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionDelta.java
index d1b58c260d1..2905135a244 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionDelta.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionDelta.java
@@ -171,6 +171,7 @@ public class CProjectDescriptionDelta implements ICDescriptionDelta {
 		if ((flags&EXT_REF)!=0) str.append("EXT_REF|");
 		if ((flags&OWNER)!=0) str.append("OWNER|");
 		if ((flags&INDEX_CFG)!=0) str.append("INDEX_CFG|");
+		if ((flags&LANGUAGE_SETTINGS_PROVIDERS)!=0) str.append("LANGUAGE_SETTINGS_PROVIDERS|");
 
 		if (str.charAt(str.length()-1)=='|') str.deleteCharAt(str.length()-1);
 		return str.toString();
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java
index c23c8f9e6b9..b1ec933e40f 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java
@@ -50,6 +50,7 @@ import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;
 
 import org.eclipse.cdt.core.CCorePlugin;
+import org.eclipse.cdt.core.language.settings.providers.ILanguageSettingsProvider;
 import org.eclipse.cdt.core.model.CModelException;
 import org.eclipse.cdt.core.model.ICElement;
 import org.eclipse.cdt.core.model.ICElementDelta;
@@ -1556,6 +1557,10 @@ public class CProjectDescriptionManager implements ICProjectDescriptionManager {
 				CCorePlugin.log(e);
 			}
 
+			List<ILanguageSettingsProvider> newLSProviders = newCfg.getLanguageSettingProviders();
+			List<ILanguageSettingsProvider> oldLSProviders = oldCfg.getLanguageSettingProviders();
+			if(!newLSProviders.equals(oldLSProviders))
+				delta.addChangeFlags(ICDescriptionDelta.LANGUAGE_SETTINGS_PROVIDERS);
 
 			calculateCfgExtSettingsDelta(delta);