add txt files to g:denote_note_file_extension

README.md

@@ -85,9 +85,10 @@ nnoremap [l :lprevious<CR>
 ### Customization
 You can customize the behavior of this package using the following two global
 variables. The variable `g:denote_note_file_extensions` defaults to `['md',
-'org']` and lists the file extensions in which `:DenoteGrep` will look for the
-given pattern. The other variable `g:denote_loc_title_columns` defaults to `40`
-and specifies the number of columns used to display the titles of your notes.
+'org', 'txt']` and lists the file extensions in which `:DenoteGrep` will look
+for the given pattern. The other variable `g:denote_loc_title_columns` defaults
+to `40` and specifies the number of columns used to display the titles of your
+notes.
 
 ### Future features
 These features are planned:

after/ftplugin/markdown.vim

@@ -1,6 +1,6 @@
 " Go to file command |gf| adjustments {{{1
-" This resolves denote links in markdown and org files. The function has access
-" to the variable v:fname, which corresponds to the filename under the cursor.
+" This resolves denote links. The function has access to the variable v:fname,
+" which corresponds to the filename under the cursor.
 function s:DenoteGotoFile()
 	return v:fname !~ "^denote:"
 				\ ? v:fname

doc/denote.txt

@@ -62,7 +62,7 @@ With this setting you may specify the file extensions of all denote entries
 within which |:DenoteGrep| will search for the provided pattern. If left
 unspecified, it is set to the following default value:
 >
-	g:denote_note_file_extension = ['md', 'org']
+	g:denote_note_file_extension = ['md', 'org', 'txt']
 <
 					*'g:denote_loc_title_columns'*
 This integer specifies the number of columns used to display the titles of

plugin/denote.vim

@@ -2,7 +2,7 @@
 
 " Restrict basic operations to these files:
 if !exists('g:denote_note_file_extensions')
-	let g:denote_note_file_extensions=['md', 'org']
+	let g:denote_note_file_extensions=['md', 'org', 'txt']
 endif
 
 " Number of columns used for the title in the location window.