diff --git a/docs/project/list-of-diagnostics.md b/docs/project/list-of-diagnostics.md
index c40d4a50b30025..5f3fcbccbeafe1 100644
--- a/docs/project/list-of-diagnostics.md
+++ b/docs/project/list-of-diagnostics.md
@@ -115,6 +115,7 @@ The PR that reveals the implementation of the `<IncludeInternalObsoleteAttribute
 |  __`SYSLIB0058`__ | KeyExchangeAlgorithm, KeyExchangeStrength, CipherAlgorithm, CipherStrength, HashAlgorithm and HashStrength properties of SslStream are obsolete. Use NegotiatedCipherSuite instead. |
 |  __`SYSLIB0059`__ | SystemEvents.EventsThreadShutdown callbacks are not run before the process exits. Use AppDomain.ProcessExit instead. |
 |  __`SYSLIB0060`__ | The constructors on Rfc2898DeriveBytes are obsolete. Use the static Pbkdf2 method instead. |
+|  __`SYSLIB0061`__ | The MinBy and MaxBy taking an IComparer<TSource> are obsolete. Use the new ones that take an IComparer<TKey> instead. |
 
 ## Analyzer Warnings