1 files changed, 10 insertions, 0 deletions
diff --git a/release-notes/7.0/preview/api-diff/preview5/Microsoft.WindowsDesktop.App/7.0-preview5_System.Diagnostics.md b/release-notes/7.0/preview/api-diff/preview5/Microsoft.WindowsDesktop.App/7.0-preview5_System.Diagnostics.md
new file mode 100644
index 00000000..68f7bc77
--- /dev/null
+++ b/release-notes/7.0/preview/api-diff/preview5/Microsoft.WindowsDesktop.App/7.0-preview5_System.Diagnostics.md
@@ -0,0 +1,10 @@
+# System.Diagnostics
+
+``` diff
+ namespace System.Diagnostics {
+     public sealed class PerformanceCounter : Component, ISupportInitialize {
+         public static int DefaultFileMappingSize;
+     }
+ }
+```
+