diff --git a/dsf-gdb/org.eclipse.cdt.dsf.gdb/src/org/eclipse/cdt/dsf/gdb/service/GdbDebugServicesFactoryNS.java b/dsf-gdb/org.eclipse.cdt.dsf.gdb/src/org/eclipse/cdt/dsf/gdb/service/GdbDebugServicesFactoryNS.java
index 093e00e56a8..7b1bd99fe81 100644
--- a/dsf-gdb/org.eclipse.cdt.dsf.gdb/src/org/eclipse/cdt/dsf/gdb/service/GdbDebugServicesFactoryNS.java
+++ b/dsf-gdb/org.eclipse.cdt.dsf.gdb/src/org/eclipse/cdt/dsf/gdb/service/GdbDebugServicesFactoryNS.java
@@ -13,6 +13,11 @@ package org.eclipse.cdt.dsf.gdb.service;
 import org.eclipse.cdt.dsf.debug.service.IRunControl;
 import org.eclipse.cdt.dsf.service.DsfSession;
 
+/**
+ * This variant is for non-stop (NS) multi-threaded debugging, a gdb capability
+ * introduced in version 6.8.50. We provide a specialized NS implementation of
+ * the run control service; that's the only specialization.
+ */
 public class GdbDebugServicesFactoryNS extends GdbDebugServicesFactory {
 
 	public GdbDebugServicesFactoryNS(String version) {