runtime(compiler): add comment for Dispatch

closes: #16854

Signed-off-by: Konfekt <Konfekt@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/compiler/context.vim b/runtime/compiler/context.vim
index 093943e..c3780d4 100644
--- a/runtime/compiler/context.vim
+++ b/runtime/compiler/context.vim
@@ -6,6 +6,7 @@
 # Contributors:       Enno Nagel
 # Last Change:        2024 Mar 29
 #                     2024 Apr 03 by The Vim Project (removed :CompilerSet definition)
+#                     2025 Mar 11 by The Vim Project (add comment for Dispatch)
 
 if exists("g:current_compiler")
   finish
@@ -15,6 +16,7 @@
 
 g:current_compiler = 'context'
 
+# CompilerSet makeprg=context
 if get(b:, 'context_ignore_makefile', get(g:, 'context_ignore_makefile', 0)) ||
   (!filereadable('Makefile') && !filereadable('makefile'))
   var makeprg =  join(context.ConTeXtCmd(shellescape(expand('%:p:t'))), ' ')