diff --git a/doc-trace.rkt b/doc-trace.rkt
index e4577c9..20f922f 100644
--- a/doc-trace.rkt
+++ b/doc-trace.rkt
@@ -9,6 +9,7 @@
          "service/definition.rkt"
          "service/diagnostic.rkt"
          "service/declaration.rkt"
+         "service/project-references.rkt"
          "service/highlight.rkt")
 
 (define build-trace%
@@ -21,6 +22,7 @@
     (define definitions (new definition% [src src]))
     (define diag (new diag% [src src] [doc-text doc-text]))
     (define decls (new declaration%))
+    (define project-references (new project-references% [src src]))
     (define semantic-tokens (new highlight% [src src] [doc-text doc-text]))
 
     (define services
@@ -67,6 +69,7 @@
     (define/public (get-definitions) (send definitions get))
     (define/public (get-quickfixs) (cadr (send diag get)))
     (define/public (get-semantic-tokens) (send semantic-tokens get))
+    (define/public (get-nonlocal-references uri symbol) (find-nonlocal-references uri symbol))
 
     ;; Overrides
     (define/override (syncheck:find-source-object stx)
diff --git a/service/declaration.rkt b/service/declaration.rkt
index f0a4f2c..8523ba2 100644
--- a/service/declaration.rkt
+++ b/service/declaration.rkt
@@ -60,7 +60,8 @@
     (define/override (syncheck:add-jump-to-definition _src-obj start end id filename _submods)
       (define decl (Decl filename id 0 0))
       ;; NOTE start <= end. In some situations, it may be that start = end.
-      (interval-map-set! sym-bindings start (if (= start end) (add1 end) end) decl))
+      (define end- (if (= start end) (add1 end) end))
+      (interval-map-set! sym-bindings start end- decl))
 
     (define/override (syncheck:add-arrow/name-dup _start-src-obj start-left start-right
                                                   _end-src-obj end-left end-right
diff --git a/service/project-references.rkt b/service/project-references.rkt
new file mode 100644
index 0000000..d52bdf3
--- /dev/null
+++ b/service/project-references.rkt
@@ -0,0 +1,41 @@
+#lang racket/base
+
+(require "interface.rkt"
+         "../struct.rkt"
+         racket/class
+         racket/set
+         racket/file
+         racket/path
+         drracket/check-syntax)
+
+(provide project-references%
+         find-nonlocal-references)
+
+(define (project-files)
+  (define files (mutable-set))
+
+  ;; FIXME: use loaded sufficies
+  ;; FIXME: use workspace folders
+  (for ([path (find-files (lambda (path) (path-has-extension? path #".rkt")) (current-directory))])
+    (set-add! files (path->complete-path path)))
+
+  files)
+
+(define projectwise-references (make-hash))
+(define (find-nonlocal-references uri symbol)
+  (hash-ref projectwise-references (list uri symbol)))
+
+(define project-references%
+  (class base-service%
+    (init-field src)
+    (super-new)
+
+    (define/override (syncheck:add-jump-to-definition _src-obj start end id filename _submods)
+      ;; NOTE start <= end. In some situations, it may be that start = end.
+      (define end- (if (= start end) (add1 end) end))
+      (when (set-member? (project-files) filename)
+        (println "Reference to other file!")
+        (hash-update! projectwise-references
+          (list filename id)
+          (lambda (refs) (set-add refs (list src start end-)))
+          (set))))))
diff --git a/text-document.rkt b/text-document.rkt
index 06ee2a0..74d10c0 100644
--- a/text-document.rkt
+++ b/text-document.rkt
@@ -404,10 +404,13 @@
 
       (define doc-decls (send doc-trace get-sym-decls))
       (match-define (Decl req? id left right) decl)
+
+      (define nonlocal-refs (send doc-trace get-nonlocal-references uri id))
+
       (define-values (bind-start bind-end bindings)
         (interval-map-ref/bounds doc-decls left #f))
       (if bindings
-          (for/list ([range (in-set bindings)])
+          (for/list ([range (in-set (set-union bindings nonlocal-refs))])
             (start/end->range doc (car range) (cdr range)))
           empty))))
 
diff --git a/workspace.rkt b/workspace.rkt
index 1e73841..f8cc2f7 100644
--- a/workspace.rkt
+++ b/workspace.rkt
@@ -3,7 +3,8 @@
          didChangeWorkspaceFolders
          didChangeWatchedFiles
          didChangeConfiguration
-         update-configuration)
+         update-configuration
+         workspace-folders)
 (require compiler/module-suffix)
 (require "json-util.rkt"
          "doc.rkt"