diff --git a/src/evalbuffer.c b/src/evalbuffer.c
index e611c52..6ec734d 100644
--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -653,6 +653,7 @@
     dict_add_number(dict, "changedtick", CHANGEDTICK(buf));
     dict_add_number(dict, "hidden",
 			    buf->b_ml.ml_mfp != NULL && buf->b_nwindows == 0);
+    dict_add_number(dict, "command", buf == cmdwin_buf);
 
     // Get a reference to buffer variables
     dict_add_dict(dict, "variables", buf->b_vars);