diff --git a/src/libraries/System.IO.Compression/src/System/IO/Compression/ZipArchiveMode.cs b/src/libraries/System.IO.Compression/src/System/IO/Compression/ZipArchiveMode.cs
index 9119fc1a9aba9..45e6f16ce8666 100644
--- a/src/libraries/System.IO.Compression/src/System/IO/Compression/ZipArchiveMode.cs
+++ b/src/libraries/System.IO.Compression/src/System/IO/Compression/ZipArchiveMode.cs
@@ -13,10 +13,9 @@ public enum ZipArchiveMode
         /// </summary>
         Read,
         /// <summary>
-        /// Only supports the creation of new archives.
-        /// Only writing to newly created entries in the archive is permitted.
-        /// Each entry in the archive can only be opened for writing once.
-        /// If only one entry is written to at a time, data will be written to the underlying stream or file as soon as it is available.
+        /// Only supports appending new entries to a new or existing archive. Only writing to these newly-created entries is permitted.
+        /// Each such entry can only be opened for writing once, and only one entry may be open at a time.
+        /// Data written to entries will be directly written through to the underlying stream or file.
         /// The underlying stream must be writable, but need not be seekable.
         /// </summary>
         Create,