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diff --git a/docs/G-Codes.md b/docs/G-Codes.md
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+++ b/docs/G-Codes.md
@@ -1219,8 +1219,9 @@ The following commands are available when any of the
are enabled.
#### DUMP_TMC
-`DUMP_TMC STEPPER=<name>`: This command will read the TMC driver
-registers and report their values.
+`DUMP_TMC STEPPER=<name>` [REGISTER=<name>]: This command will read all TMC
+driver registers and report their values. If a REGISTER is provided, only
+the specified register will be dumped.
#### INIT_TMC
`INIT_TMC STEPPER=<name>`: This command will initialize the TMC