diff --git a/pypdf/constants.py b/pypdf/constants.py
index 9ecdf0e82..9f7327adf 100644
--- a/pypdf/constants.py
+++ b/pypdf/constants.py
@@ -440,6 +440,21 @@ class PageLabelStyle:
     UPPERCASE_LETTER = "/A"  # Uppercase letters
 
 
+class AnnotationFlag(IntFlag):
+    """See 12.5.3 "Anntation Flags"."""
+
+    INVISIBLE = 1
+    HIDDEN = 2
+    PRINT = 4
+    NO_ZOOM = 8
+    NO_ROTATE = 16
+    NO_VIEW = 32
+    READ_ONLY = 64
+    LOCKED = 128
+    TOGGLE_NO_VIEW = 256
+    LOCKED_CONTENTS = 512
+
+
 PDF_KEYS = (
     AnnotationDictionaryAttributes,
     CatalogAttributes,
diff --git a/pypdf/generic/_annotations.py b/pypdf/generic/_annotations.py
index 555bc206e..f9d0f3de6 100644
--- a/pypdf/generic/_annotations.py
+++ b/pypdf/generic/_annotations.py
@@ -1,5 +1,6 @@
 from typing import TYPE_CHECKING, List, Optional, Tuple, Union
 
+from ..constants import AnnotationFlag
 from ._base import (
     BooleanObject,
     FloatObject,
@@ -12,6 +13,8 @@
 from ._rectangle import RectangleObject
 from ._utils import hex_to_rgb, logger_warning
 
+NO_FLAGS = AnnotationFlag(0)
+
 
 def _get_bounding_rectangle(vertices: List[Tuple[float, float]]) -> RectangleObject:
     x_min, y_min = vertices[0][0], vertices[0][1]
@@ -145,8 +148,9 @@ def free_text(
 
     @staticmethod
     def popup(
+        *,
         rect: Union[RectangleObject, Tuple[float, float, float, float]],
-        flags: int = 0,
+        flags: AnnotationFlag = NO_FLAGS,
         parent: Optional[DictionaryObject] = None,
         open: bool = False,
     ) -> DictionaryObject:
@@ -174,7 +178,7 @@ def popup(
                 NameObject("/Subtype"): NameObject("/Popup"),
                 NameObject("/Rect"): RectangleObject(rect),
                 NameObject("/Open"): BooleanObject(open),
-                NameObject("/Flags"): NumberObject(flags),
+                NameObject("/F"): NumberObject(flags),
             }
         )
         if parent: