diff --git a/docs/generated/sql/bnf/create_func_stmt.bnf b/docs/generated/sql/bnf/create_func_stmt.bnf
index d79b6b7bb70f..2b432c3d13f0 100644
--- a/docs/generated/sql/bnf/create_func_stmt.bnf
+++ b/docs/generated/sql/bnf/create_func_stmt.bnf
@@ -1,2 +1,2 @@
 create_func_stmt ::=
-	'CREATE' ( 'OR' 'REPLACE' |  ) 'FUNCTION' func_create_name '(' ( ( ( ( func_arg | func_arg   | func_arg   ) ) ( ( ',' ( func_arg | func_arg   | func_arg   ) ) )* ) |  ) ')' 'RETURNS' (  |  ) ( func_arg_type ) ( ( ( ( 'AS' func_as | 'LANGUAGE' 'SQL' | ( 'CALLED' 'ON' 'NULL' 'INPUT' | 'RETURNS' 'NULL' 'ON' 'NULL' 'INPUT' | 'STRICT' | 'IMMUTABLE' | 'STABLE' | 'VOLATILE' | 'LEAKPROOF' | 'NOT' 'LEAKPROOF' ) ) ) ( ( ( 'AS' func_as | 'LANGUAGE' 'SQL' | ( 'CALLED' 'ON' 'NULL' 'INPUT' | 'RETURNS' 'NULL' 'ON' 'NULL' 'INPUT' | 'STRICT' | 'IMMUTABLE' | 'STABLE' | 'VOLATILE' | 'LEAKPROOF' | 'NOT' 'LEAKPROOF' ) ) ) )* ) |  ) opt_routine_body
+	'CREATE' ( 'OR' 'REPLACE' |  ) 'FUNCTION' func_create_name '(' ( ( ( ( func_arg | func_arg   | func_arg   ) ) ( ( ',' ( func_arg | func_arg   | func_arg   ) ) )* ) |  ) ')' 'RETURNS' (  |  ) ( func_arg_type ) ( ( ( ( 'AS' ( 'SCONST' ) | 'LANGUAGE' 'SQL' | ( 'CALLED' 'ON' 'NULL' 'INPUT' | 'RETURNS' 'NULL' 'ON' 'NULL' 'INPUT' | 'STRICT' | 'IMMUTABLE' | 'STABLE' | 'VOLATILE' | 'LEAKPROOF' | 'NOT' 'LEAKPROOF' ) ) ) ( ( ( 'AS' ( 'SCONST' ) | 'LANGUAGE' 'SQL' | ( 'CALLED' 'ON' 'NULL' 'INPUT' | 'RETURNS' 'NULL' 'ON' 'NULL' 'INPUT' | 'STRICT' | 'IMMUTABLE' | 'STABLE' | 'VOLATILE' | 'LEAKPROOF' | 'NOT' 'LEAKPROOF' ) ) ) )* ) |  ) opt_routine_body
diff --git a/pkg/cmd/docgen/diagrams.go b/pkg/cmd/docgen/diagrams.go
index b0a392dc7df7..64decb58716d 100644
--- a/pkg/cmd/docgen/diagrams.go
+++ b/pkg/cmd/docgen/diagrams.go
@@ -757,9 +757,10 @@ var specs = []stmtSpec{
 	},
 	{
 		name:   "create_func_stmt",
-		inline: []string{"opt_or_replace", "opt_func_arg_with_default_list", "opt_return_set", "func_return_type", "opt_create_func_opt_list", "create_func_opt_list", "common_func_opt_item", "create_func_opt_item", "routine_return_stmt", "func_arg_with_default_list", "func_arg_with_default"},
-		unlink: []string{"opt_or_replace", "opt_func_arg_with_default_list", "opt_return_set", "func_return_type", "opt_create_func_opt_list", "create_func_opt_list", "create_func_opt_item", "common_func_opt_item", "routine_return_stmt", "non_reserved_word_or_sconst", "func_arg_with_default_list", "func_arg_with_default", "a_expr"},
+		inline: []string{"opt_or_replace", "opt_func_arg_with_default_list", "opt_return_set", "func_return_type", "opt_create_func_opt_list", "create_func_opt_list", "common_func_opt_item", "create_func_opt_item", "routine_return_stmt", "func_arg_with_default_list", "func_arg_with_default", "func_as"},
+		unlink: []string{"opt_or_replace", "opt_func_arg_with_default_list", "opt_return_set", "func_return_type", "opt_create_func_opt_list", "create_func_opt_list", "create_func_opt_item", "common_func_opt_item", "routine_return_stmt", "non_reserved_word_or_sconst", "func_arg_with_default_list", "func_arg_with_default", "a_expr", "func_as"},
 		replace: map[string]string{
+			"func_as":                     "'SCONST'",
 			"non_reserved_word_or_sconst": "'SQL'",
 			"'DEFAULT'":                   "",
 			"'SETOF'":                     "",