diff --git a/PyPDF2/generic.py b/PyPDF2/generic.py
index 652b6314a..3aa28432a 100644
--- a/PyPDF2/generic.py
+++ b/PyPDF2/generic.py
@@ -862,7 +862,7 @@ def read_unsized_from_steam(stream: StreamType, pdf: Any) -> bytes:  # PdfReader
                     stream.seek(pos, 0)
                     raise PdfReadError(
                         "Unable to find 'endstream' marker after stream at byte "
-                        f"{hex_str(stream.tell())}."
+                        f"{hex_str(stream.tell())} (nd='{ndstream!r}', end='{end!r}')."
                     )
         else:
             stream.seek(pos, 0)