diff --git a/runtime/syntax/sdc.vim b/runtime/syntax/sdc.vim
index dbfa35e..ae2aae5 100644
--- a/runtime/syntax/sdc.vim
+++ b/runtime/syntax/sdc.vim
@@ -1,9 +1,10 @@
 " Vim syntax file
 " Language:     SDC - Synopsys Design Constraints
 " Maintainer:   Maurizio Tranchero - maurizio.tranchero@gmail.com
-" Last Change:  Thu Mar  25 17:35:16 CET 2009
 " Credits:      based on TCL Vim syntax file
 " Version:	0.3
+" Last Change:  Thu Mar  25 17:35:16 CET 2009
+" 2024 Jul 17 by Vim Project (update to SDC 2.1)
 
 " Quit when a syntax file was already loaded
 if exists("b:current_syntax")
@@ -13,16 +14,48 @@
 " Read the TCL syntax to start with
 runtime! syntax/tcl.vim
 
-" SDC-specific keywords
+" TCL extension related to SDC and available from some vendors
+" (not defined in SDC standard!)
 syn keyword sdcCollections	foreach_in_collection
-syn keyword sdcObjectsQuery	get_clocks get_ports
 syn keyword sdcObjectsInfo	get_point_info get_node_info get_path_info
 syn keyword sdcObjectsInfo	get_timing_paths set_attribute
-syn keyword sdcConstraints	set_false_path
+
+" SDC rev. 2.1 specific keywords
+syn keyword sdcObjectsQuery	get_clocks get_ports get_cells
+syn keyword sdcObjectsQuery	get_pins get_nets all_inputs
+syn keyword sdcObjectsQuery	all_outputs all_registers all_clocks
+syn keyword sdcObjectsQuery	get_libs get_lib_cells get_lib_pins
+
+syn keyword sdcConstraints	set_false_path set_clock_groups set_sense
+syn keyword sdcConstraints	set_propagated_clock set_clock_gating_check
+syn keyword sdcConstraints	set_ideal_latency set_ideal_network
+syn keyword sdcConstraints	set_ideal_transistion set_max_time_borrow
+syn keyword sdcConstraints	set_data_check group_path set_max_transition
+syn keyword sdcConstraints	set_max_fanout set_driving_cell
+syn keyword sdcConstraints	set_port_fanout_number set_multi_cycle_path
+syn keyword sdcConstraints	set_disable_timing set_min_pulse_width
+
 syn keyword sdcNonIdealities	set_min_delay set_max_delay
 syn keyword sdcNonIdealities	set_input_delay set_output_delay
 syn keyword sdcNonIdealities	set_load set_min_capacitance set_max_capacitance
+syn keyword sdcNonIdealities	set_clock_latency set_clock_transition set_clock_uncertainty
+syn keyword sdcNonIdealities	set_resistance set_timing_derate set_drive
+syn keyword sdcNonIdealities	set_input_transition set_fanout_load
+
 syn keyword sdcCreateOperations	create_clock create_timing_netlist update_timing_netlist
+syn keyword sdcCreateOperations	create_generated_clock
+
+syn keyword sdcPowerArea	set_max_area create_voltage_area
+syn keyword sdcPowerArea	set_level_shifter_threshold set_max_dynamic_power
+syn keyword sdcPowerArea	set_level_shifter_strategy set_max_leakage_power
+
+syn keyword sdcModeConfig	set_case_analysis set_logic_dc
+syn keyword sdcModeConfig	set_logic_zero set_logic_one
+
+syn keyword sdcMiscCommmands	sdc_version set_wire_load_selection_group
+syn keyword sdcMiscCommmands	set_units set_wire_load_mode set_wire_load_model
+syn keyword sdcMiscCommmands	set_wire_load_min_block_size set_operating_conditions
+syn keyword sdcMiscCommmands	current_design
 
 " command flags highlighting
 syn match sdcFlags		"[[:space:]]-[[:alpha:]_]*\>"
@@ -31,9 +64,12 @@
 hi def link sdcCollections      Repeat
 hi def link sdcObjectsInfo      Operator
 hi def link sdcCreateOperations	Operator
-hi def link sdcObjectsQuery	Operator
+hi def link sdcObjectsQuery	Function
 hi def link sdcConstraints	Operator
 hi def link sdcNonIdealities	Operator
+hi def link sdcPowerArea	Operator
+hi def link sdcModeConfig	Operator
+hi def link sdcMiscCommmands	Operator
 hi def link sdcFlags		Special
 
 let b:current_syntax = "sdc"