diff --git a/debian/Makefile b/debian/Makefile
index fbd29720b..c08e91fbf 100644
--- a/debian/Makefile
+++ b/debian/Makefile
@@ -158,6 +158,7 @@ header-install-$(subarch): templates/header-install.in
 post-install-$(subarch): templates/post-install.in
 	sed -e 's,@initrd_modules@,$(initrd_modules),'	\
 	    -e 's,@append_subarch@,$(append),'		\
+	    -e 's,@extra_postinstall_command@,$(extra_postinstall_command),'	\
 	    templates/post-install.in > post-install-$(subarch)
 #
 # Generates the kernel config file for a subarch by merging
diff --git a/debian/README b/debian/README
index 97c24f1eb..b4fc7d93f 100644
--- a/debian/README
+++ b/debian/README
@@ -210,3 +210,13 @@ default_config
   Typical usage:
 
   default_config := 386
+
+extra_postinstall_command
+
+  This variable, if defined, is executed at the end of the post-install script,
+  which is used by kernel-package to add or modify the files going into the
+  kernel image package.
+
+  It can use these variables (but see templates/post-install.in for details) :
+  $(subarch), $(flavour), $(version) and $(abiname). Since Makefile.inc is a
+  Makefile, the leading $ need to be escaped as double $$.
diff --git a/debian/templates/post-install.in b/debian/templates/post-install.in
index 3e025431a..1e62c3115 100644
--- a/debian/templates/post-install.in
+++ b/debian/templates/post-install.in
@@ -105,6 +105,12 @@ if [ -n "${modules}" ]; then
     fi
   done
 fi
+
+# Execute any extra post-install command provided by the arch/subarch/flavour
+if [ '@extra_postinstall_command@' ]; then
+  @extra_postinstall_command@
+fi
+
 #
 # Clean up the build and source symlinks
 #