diff --git a/examples/constraints.txt b/examples/constraints.txt
new file mode 120000
index 0000000..d54bfb5
--- /dev/null
+++ b/examples/constraints.txt
@@ -0,0 +1 @@
+requirements.txt
\ No newline at end of file
diff --git a/ftdetect/requirements.vim b/ftdetect/requirements.vim
index a5e21b6..6c893cb 100644
--- a/ftdetect/requirements.vim
+++ b/ftdetect/requirements.vim
@@ -22,6 +22,10 @@ function! Requirements_matched_filename(filename)
         return 1
     endif
 
+    if a:filename =~# '\v.constraints\.(txt|in)$'
+        return 1
+    endif
+
     if len(g:requirements#detect_filename_pattern)
         \ && a:filename =~# g:requirements#detect_filename_pattern
         return 1