diff --git a/doc/src/sgml/xact.sgml b/doc/src/sgml/xact.sgml
index ab22e45b05c..a707cc5eb51 100644
--- a/doc/src/sgml/xact.sgml
+++ b/doc/src/sgml/xact.sgml
@@ -122,7 +122,7 @@
    Subtransactions can be started explicitly using the
    <command>SAVEPOINT</command> command, but can also be started in
    other ways, such as PL/pgSQL's <command>EXCEPTION</command> clause.
-   PL/Python and PL/TCL also support explicit subtransactions.
+   PL/Python and PL/Tcl also support explicit subtransactions.
    Subtransactions can also be started from other subtransactions.
    The top-level transaction and its child subtransactions form a
    hierarchy or tree, which is why we refer to the main transaction as