diff --git a/doc/help/commands.asciidoc b/doc/help/commands.asciidoc
index 5ac7dc935..8cc5184f8 100644
--- a/doc/help/commands.asciidoc
+++ b/doc/help/commands.asciidoc
@@ -811,7 +811,8 @@ If neither count nor index are given, it behaves like tab-next. If both are give
 
 
 ==== count
-The tab index to focus, starting with 1.
+The tab index to focus, starting with 1. The special value 0 focuses the rightmost tab.
+
 
 [[tab-move]]
 === tab-move