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diff --git a/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Formats.Asn1.md b/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Formats.Asn1.md
new file mode 100644
index 00000000..50ae13a1
--- /dev/null
+++ b/release-notes/7.0/preview/api-diff/rc1/Microsoft.NETCore.App/7.0-rc1_System.Formats.Asn1.md
@@ -0,0 +1,10 @@
+# System.Formats.Asn1
+
+``` diff
+ namespace System.Formats.Asn1 {
+     public sealed class AsnWriter {
++        public AsnWriter(AsnEncodingRules ruleSet, int initialCapacity);
+     }
+ }
+```
+