diff --git a/README.md b/README.md
index 9d52478..74bcfd5 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,6 @@ Most commands require Administrator privileges to execute. WinSW will prompt for
* [XML configuration file](docs/xml-config-file.md)
* [Logging and error reporting](docs/logging-and-error-reporting.md)
* [Extensions](docs/extensions/extensions.md)
- * [Shared Directory Mapper](docs/extensions/shared-directory-mapper.md)
* Use cases:
* [Self-restarting services](docs/self-restarting-service.md)
* [Deferred file operations](docs/deferred-file-operations.md)
diff --git a/docs/extensions/shared-directory-mapper.md b/docs/extensions/shared-directory-mapper.md
deleted file mode 100644
index 402ada4..0000000
--- a/docs/extensions/shared-directory-mapper.md
+++ /dev/null
@@ -1,38 +0,0 @@
-# Shared Directory Mapper extension
-
-By default Windows does not establish shared drive mapping for services even if it is configured in the Windows service profile.
-And sometimes it is impossible to workaround it due to the domain policies.
-
-This extension allows mapping external shared directories before starting up the executable.
-
-Since: WinSW 2.0.
-
-## Usage
-
-The extension can be configured via the [XML configuration file](../xml-config-file.md).
-Configuration sample:
-
-```xml
-
-
- sampleService
- Sample service
- This is a stub service.
- %BASE%\sleep.bat
-
-
-
-
-
-
-
-
-
-
-
-
-```
-
-## Notes
-
-* If the extension fails to map the drive, the startup fails
diff --git a/docs/migrate-to-3-x.md b/docs/migrate-to-3-x.md
index ed4015c..98bdaed 100644
--- a/docs/migrate-to-3-x.md
+++ b/docs/migrate-to-3-x.md
@@ -19,3 +19,5 @@ TODO
1. Replace `` with `true`.
1. Replace `` with `true`.
1. Replace `` with `true`.
+1. Remove the `RunawayProcessKiller` extension.
+1. Move `.