diff --git a/Doc/tutorial/inputoutput.rst b/Doc/tutorial/inputoutput.rst
index 2e6fd419b21..35b8c7cd8eb 100644
--- a/Doc/tutorial/inputoutput.rst
+++ b/Doc/tutorial/inputoutput.rst
@@ -100,6 +100,13 @@ yet another way to substitute values into strings, using placeholders like
 ``$x`` and replacing them with values from a dictionary, but offers much less
 control of the formatting.
 
+.. index::
+   single: formatted string literal
+   single: interpolated string literal
+   single: string; formatted literal
+   single: string; interpolated literal
+   single: f-string
+   single: fstring
 
 .. _tut-f-strings: