1 files changed, 2 insertions, 0 deletions
diff --git a/src/nvim/eval/window.c b/src/nvim/eval/window.c
index b1e1669826..f58a0c488a 100644
--- a/src/nvim/eval/window.c
+++ b/src/nvim/eval/window.c
@@ -140,6 +140,8 @@ void win_findbuf(typval_T *argvars, list_T *list)
 /// Find window specified by "vp" in tabpage "tp".
 ///
 /// @param tp  NULL for current tab page
+/// @return  current window if "vp" is number zero.
+///          NULL if not found.
 win_T *find_win_by_nr(typval_T *vp, tabpage_T *tp)
 {
   int nr = (int)tv_get_number_chk(vp, NULL);