diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 4ae84ec5a63..531147f6e6b 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -7048,6 +7048,7 @@ locking the OS scheduler to allow only a single thread to run.
 
 @table @code
 @item set scheduler-locking @var{mode}
+@cindex scheduler-locking
 @cindex scheduler locking mode
 @cindex lock scheduler
 Set the scheduler locking mode.  It applies to normal execution,