diff --git a/vim/syntax/notmuch-search.vim b/vim/syntax/notmuch-search.vim
index 832b2b84..3c2b2729 100644
--- a/vim/syntax/notmuch-search.vim
+++ b/vim/syntax/notmuch-search.vim
@@ -9,6 +9,7 @@ syntax region nmSearchFrom      start='\]\@<=' end='|'     oneline contained
 syntax match  nmSearchCountZero '0/\(\d\+\)'               contained
 syntax match  nmSearchCountSome '\([1-9]\d*\)/\(\d\+\)'    contained
 syntax match  nmSearchCountAll  '\(\d\+\)/\1'              contained
+syntax match  nmSearchSquareBracketText '\(\[\w\+\]\)'
 syntax match  nmSearchTags      /([^)]\+)$/
 
 highlight link nmSearchDate      Statement
@@ -17,6 +18,7 @@ highlight link nmSearchCountZero Function
 highlight link nmSearchCountSome Special
 highlight link nmSearchCountAll  Type
 highlight link nmSearchFrom      Include
+highlight link nmSearchSquareBracketText Special
 highlight link nmSearchTags      String
 
 highlight CursorLine term=reverse cterm=reverse gui=reverse