diff --git a/xml/System.Collections.Concurrent/ConcurrentStack`1.xml b/xml/System.Collections.Concurrent/ConcurrentStack`1.xml
index e91c8af2708..44aee70b1a4 100644
--- a/xml/System.Collections.Concurrent/ConcurrentStack`1.xml
+++ b/xml/System.Collections.Concurrent/ConcurrentStack`1.xml
@@ -605,7 +605,7 @@
         <exception cref="T:System.ArgumentNullException">
           <paramref name="items" /> is a null reference (Nothing in Visual Basic).</exception>
         <exception cref="T:System.ArgumentOutOfRangeException">
-          <paramref name="startIndex" /> or <paramref name="count" /> is negative. Or <paramref name="startIndex" /> is greater than or equal to the length of <paramref name="items" />.</exception>
+          <paramref name="startIndex" /> or <paramref name="count" /> is negative. Or <paramref name="startIndex" /> is greater than the length of <paramref name="items" />.</exception>
         <exception cref="T:System.ArgumentException">
           <paramref name="startIndex" /> + <paramref name="count" /> is greater than the length of <paramref name="items" />.</exception>
         <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>
@@ -1221,7 +1221,7 @@ This member is an explicit interface member implementation. It can be used only
         <exception cref="T:System.ArgumentNullException">
           <paramref name="items" /> is a null reference (Nothing in Visual Basic).</exception>
         <exception cref="T:System.ArgumentOutOfRangeException">
-          <paramref name="startIndex" /> or <paramref name="count" /> is negative. Or <paramref name="startIndex" /> is greater than or equal to the length of <paramref name="items" />.</exception>
+          <paramref name="startIndex" /> or <paramref name="count" /> is negative. Or <paramref name="startIndex" /> is greater than the length of <paramref name="items" />.</exception>
         <exception cref="T:System.ArgumentException">
           <paramref name="startIndex" /> + <paramref name="count" /> is greater than the length of <paramref name="items" />.</exception>
         <related type="Article" href="/dotnet/standard/collections/thread-safe/">Thread-Safe Collections</related>