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-rw-r--r--runtime/syntax/sdc.vim2
1 files changed, 1 insertions, 1 deletions
diff --git a/runtime/syntax/sdc.vim b/runtime/syntax/sdc.vim
index 0ca9becf73..dbfa35eeb6 100644
--- a/runtime/syntax/sdc.vim
+++ b/runtime/syntax/sdc.vim
@@ -25,7 +25,7 @@ syn keyword sdcNonIdealities set_load set_min_capacitance set_max_capacitance
syn keyword sdcCreateOperations create_clock create_timing_netlist update_timing_netlist
" command flags highlighting
-syn match sdcFlags "[[:space:]]-[[:alpha:]]*\>"
+syn match sdcFlags "[[:space:]]-[[:alpha:]_]*\>"
" Define the default highlighting.
hi def link sdcCollections Repeat