diff --git a/mast/timeline.go b/mast/timeline.go
index 3d62dab..e8c0291 100644
--- a/mast/timeline.go
+++ b/mast/timeline.go
@@ -24,6 +24,7 @@ type Timeline struct {
   Account                    mastodon.Account
   Toots                      []Toot
   TootIndexStatusIDMappings  map[string]int
+  KnownUsers                 []string
 }
 
 func NewTimeline(mastodonClient *mastodon.Client) Timeline {
@@ -79,6 +80,7 @@ func (timeline *Timeline) Load(timelineType TimelineType) (error) {
     if exists == false {
       tootIndex := len(timeline.Toots)
       timeline.Toots = append(timeline.Toots, NewToot(timeline.client, status, tootIndex))
+      timeline.KnownUsers = append(timeline.KnownUsers, status.Account.Acct) // TODO: Deduplicate
       timeline.TootIndexStatusIDMappings[id] = tootIndex
     }
   }
diff --git a/tui/tui.go b/tui/tui.go
index ce49052..aa442fb 100644
--- a/tui/tui.go
+++ b/tui/tui.go
@@ -36,7 +36,9 @@ func TUI(tuiCore TUICore, mastodonClient *mastodon.Client) {
   tuiCore.CmdLine = tview.NewInputField().
     SetLabelColor(tcell.ColorDefault).
     SetFieldBackgroundColor(tcell.ColorDefault).
-    SetAutocompleteFunc(mast.CmdAutocompleter).
+    SetAutocompleteFunc(func(input string) ([]string) {
+      return mast.CmdAutocompleter(input, tuiCore.Timeline.KnownUsers)
+    }).
     SetDoneFunc(func(key tcell.Key) {
       if key == tcell.KeyEnter {
         cmd := tuiCore.CmdLine.GetText()