diff --git a/message_definitions/gemini.xml b/message_definitions/gemini.xml
index 4d36ec99cbe1b0b9f9028289fed7cff01a793aa3..7eee2916d6f66cd656c9b65ea08a4aaba33fdcb3 100644
--- a/message_definitions/gemini.xml
+++ b/message_definitions/gemini.xml
@@ -284,7 +284,7 @@
         <message id="17" name="SET_ATOMIC_VALVE_TIMING_TC">
             <description>Sets the maximum time that the valves can be open atomically</description>
             <field name="servo_id" type="uint8_t">A member of the ServosList enum</field>
-            <field name="maximum_timing" type="uint32_t">Maximum timing in [sec]</field>
+            <field name="maximum_timing" type="uint32_t">Maximum timing in [ms]</field>
         </message>
         <message id="18" name="SET_VALVE_MAXIMUM_APERTURE_TC">
             <description>Sets the maximum aperture of the specified valve. Set as value from 0 to 1</description>