diff --git a/direct/src/p3d/DWBPackageInstaller.py b/direct/src/p3d/DWBPackageInstaller.py
index c4daa67cb1..3f9aab4c77 100644
--- a/direct/src/p3d/DWBPackageInstaller.py
+++ b/direct/src/p3d/DWBPackageInstaller.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["DWBPackageInstaller"]
 
 from direct.p3d.PackageInstaller import PackageInstaller
diff --git a/direct/src/p3d/FileSpec.py b/direct/src/p3d/FileSpec.py
index ddd1dafd6e..c709426e37 100644
--- a/direct/src/p3d/FileSpec.py
+++ b/direct/src/p3d/FileSpec.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["FileSpec"]
 
 import os
diff --git a/direct/src/p3d/HostInfo.py b/direct/src/p3d/HostInfo.py
index 4e5efdcd3e..08b2081497 100644
--- a/direct/src/p3d/HostInfo.py
+++ b/direct/src/p3d/HostInfo.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["HostInfo"]
 
 from panda3d.core import HashVal, Filename, PandaSystem, DocumentSpec, Ramfile
diff --git a/direct/src/p3d/InstalledHostData.py b/direct/src/p3d/InstalledHostData.py
index d98abb6d18..1a8a0f9dba 100644
--- a/direct/src/p3d/InstalledHostData.py
+++ b/direct/src/p3d/InstalledHostData.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["InstalledHostData"]
 
 from panda3d.core import URLSpec
diff --git a/direct/src/p3d/InstalledPackageData.py b/direct/src/p3d/InstalledPackageData.py
index 09ee81cda6..34af2163e3 100644
--- a/direct/src/p3d/InstalledPackageData.py
+++ b/direct/src/p3d/InstalledPackageData.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["InstalledPackageData"]
 
 class InstalledPackageData:
diff --git a/direct/src/p3d/PackageInfo.py b/direct/src/p3d/PackageInfo.py
index 08a73365b8..324a87546d 100644
--- a/direct/src/p3d/PackageInfo.py
+++ b/direct/src/p3d/PackageInfo.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["PackageInfo"]
 
 from panda3d.core import Filename, DocumentSpec, Multifile, Decompressor, EUOk, EUSuccess, VirtualFileSystem, Thread, getModelPath, ExecutionEnvironment, PStatCollector, TiXmlDocument, TiXmlDeclaration, TiXmlElement
diff --git a/direct/src/p3d/PackageInstaller.py b/direct/src/p3d/PackageInstaller.py
index cec1e07b11..3f17604071 100644
--- a/direct/src/p3d/PackageInstaller.py
+++ b/direct/src/p3d/PackageInstaller.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["PackageInstaller"]
 
 from direct.showbase.DirectObject import DirectObject
diff --git a/direct/src/p3d/PackageMerger.py b/direct/src/p3d/PackageMerger.py
index a22d8f5f2d..ac4b614732 100644
--- a/direct/src/p3d/PackageMerger.py
+++ b/direct/src/p3d/PackageMerger.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["PackageMerger", "PackageMergerError"]
 
 from direct.p3d.FileSpec import FileSpec
diff --git a/direct/src/p3d/PatchMaker.py b/direct/src/p3d/PatchMaker.py
index c1624b3cc1..6c50df2e0c 100644
--- a/direct/src/p3d/PatchMaker.py
+++ b/direct/src/p3d/PatchMaker.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["PatchMaker"]
 
 from direct.p3d.FileSpec import FileSpec
diff --git a/direct/src/p3d/ScanDirectoryNode.py b/direct/src/p3d/ScanDirectoryNode.py
index 429b8f0fd2..c38431101d 100644
--- a/direct/src/p3d/ScanDirectoryNode.py
+++ b/direct/src/p3d/ScanDirectoryNode.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["ScanDirectoryNode"]
 
 from panda3d.core import VirtualFileSystem, VirtualFileMountSystem, Filename, TiXmlDocument
diff --git a/direct/src/p3d/SeqValue.py b/direct/src/p3d/SeqValue.py
index 958132f74b..2fa01ace34 100644
--- a/direct/src/p3d/SeqValue.py
+++ b/direct/src/p3d/SeqValue.py
@@ -1,3 +1,8 @@
+"""
+.. deprecated:: 1.10.0
+   The p3d packaging system has been replaced with the new setuptools-based
+   system.  See the :ref:`distribution` manual section.
+"""
 __all__ = ["SeqValue"]
 
 class SeqValue: