diff --git a/context.el b/context.el
index 42d1594..882ed83 100644
--- a/context.el
+++ b/context.el
@@ -1,6 +1,6 @@
 ;;; context.el --- Support for ConTeXt documents.
 
-;; Copyright (C) 2003-2006, 2008, 2010, 2012, 2014, 2015
+;; Copyright (C) 2003-2006, 2008, 2010, 2012, 2014-2016
 ;;   Free Software Foundation, Inc.
 
 ;; Maintainer: Berend de Boer <address@hidden>
@@ -1661,6 +1661,12 @@ Use `ConTeXt-Mark-version' to choose the command."
     ConTeXt-item-list
     ConTeXt-extra-paragraph-commands))
 
+(defconst ConTeXt-dialect :context
+  "Default dialect for use with function `TeX-add-style-hook' for
+argument DIALECT-EXPR when the hook is to be run only on ConTeXt
+file, or any mode derived thereof. See variable
+`TeX-style-hook-dialect'." )
+
 (defcustom ConTeXt-clean-intermediate-suffixes
   ;; See *suffixes in texutil.pl.
   '("\\.tui" "\\.tup" "\\.ted" "\\.tes" "\\.top" "\\.log" "\\.tmp" "\\.run"
@@ -1695,6 +1701,7 @@ i.e. you do _not_ have to cater for this yourself by adding \\\\' or $."
   (setq major-mode 'context-mode)
 
   (setq local-abbrev-table context-mode-abbrev-table)
+  (set (make-local-variable 'TeX-style-hook-dialect) ConTeXt-dialect)
 
   ;; Make language specific variables buffer local
   (dolist (symbol ConTeXt-language-variable-list)
diff --git a/plain-tex.el b/plain-tex.el
index 3df6196..dfdc423 100644
--- a/plain-tex.el
+++ b/plain-tex.el
@@ -1,6 +1,6 @@
 ;;; plain-tex.el --- Support for plain TeX documents.
 
-;; Copyright (C) 2010 Free Software Foundation, Inc.
+;; Copyright (C) 2010, 2013, 2016  Free Software Foundation, Inc.
 
 ;; Maintainer: address@hidden
 ;; Keywords: tex
@@ -103,6 +103,12 @@ Install tool bar if `plain-TeX-enable-toolbar' is non-nil."
 
 ;;; The mode
 
+(defconst plain-TeX-dialect :plain-tex
+  "Default dialect for use with function `TeX-add-style-hook' for
+argument DIALECT-EXPR when the hook is to be run only on
+plain-TeX file, or any mode derived thereof. See variable
+`TeX-style-hook-dialect'." )
+
 (defcustom plain-TeX-mode-hook nil
   "A hook run in plain TeX mode buffers."
   :type 'hook
@@ -143,6 +149,7 @@ of plain-TeX-mode-hook."
   (VirTeX-common-initialization)
   (set-syntax-table TeX-mode-syntax-table)
   (setq local-abbrev-table plain-tex-mode-abbrev-table)
+  (set (make-local-variable 'TeX-style-hook-dialect) plain-TeX-dialect)
   (setq paragraph-start
 	(concat
 	 "\\(^[ \t]*$"
diff --git a/tex.el b/tex.el
index b70f363..c2c247c 100644
--- a/tex.el
+++ b/tex.el
@@ -2603,8 +2603,10 @@ For supported dialects, see variables `TeX-style-hook-dialect'.")
 Supported values are described below:
 
 * `:bibtex'  for files in BibTeX mode.
+* `:context' for files in ConTeXt mode.
 * `:latex'   for files in LaTeX mode, or any mode derived
 	     thereof.
+* `:plain-tex' for files in plain-TeX mode.
 * `:texinfo' for Texinfo files.
 
 Purpose is notably to prevent non-Texinfo hooks to be run in
@@ -2667,6 +2669,6 @@ side effect e.g. on variable `TeX-font-list'.")
 	   (load-file el)))))
 
 (defconst TeX-style-hook-dialect-weight-alist
-  '((:latex . 1) (:texinfo . 2) (:bibtex . 4))
+  '((:latex . 1) (:texinfo . 2) (:bibtex . 4) (:plain-tex . 8) (:context . 16))
   "Association list to map dialects to binary weight, in order to
   implement dialect sets as bitmaps."  )