diff --git a/_Sidebar.md b/_Sidebar.md
index 5047b53..aa6e469 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -1,4 +1,5 @@
 [Home](Home)
+[tools](tools)
  * [XML-elements](elements_XML)
      * [attribute](elements_definition_attribute)
      * child elements
diff --git a/tools.md b/tools.md
new file mode 100644
index 0000000..ccb0e73
--- /dev/null
+++ b/tools.md
@@ -0,0 +1,6 @@
+
+View XML Document https://xmlgrid.net/ 
+
+sysinternals-suite https://docs.microsoft.com/en-us/sysinternals/downloads/sysinternals-suite
+
+Windows CPU profiler https://github.com/VerySleepy/verysleepy