diff --git a/modules/docs/src/Volo.Docs.Domain/Volo/Docs/Projects/Pdf/DocsProjectPdfGeneratorOptions.cs b/modules/docs/src/Volo.Docs.Domain/Volo/Docs/Projects/Pdf/DocsProjectPdfGeneratorOptions.cs
index 92c07ed1af..f20a0e6a51 100644
--- a/modules/docs/src/Volo.Docs.Domain/Volo/Docs/Projects/Pdf/DocsProjectPdfGeneratorOptions.cs
+++ b/modules/docs/src/Volo.Docs.Domain/Volo/Docs/Projects/Pdf/DocsProjectPdfGeneratorOptions.cs
@@ -43,12 +43,6 @@ public class DocsProjectPdfGeneratorOptions
     
     public Func<string, string> DocumentContentNormalizer { get; set; }
     
-    /// <summary>
-    /// The maximum number of last versions to cache.
-    /// If null, all versions will be cached.
-    /// </summary>
-    public int? CacheLastVersionsCount { get; set; }
-    
     public DocsProjectPdfGeneratorOptions()
     {
         HtmlLayout = $@"