diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 688fc38..e5aa09c 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -3575,6 +3575,8 @@
 		Get the value of a tab-local variable {varname} in tab page
 		{tabnr}. |t:var|
 		Tabs are numbered starting with one.
+		When {varname} is empty a dictionary with all tab-local
+		variables is returned.
 		Note that the name without "t:" must be used.
 		When the tab or variable doesn't exist {def} or an empty
 		string is returned, there is no error message.