diff --git a/libraries/AP_Camera/AP_Camera.cpp b/libraries/AP_Camera/AP_Camera.cpp
index 30b722602155b..f18ae67fde620 100644
--- a/libraries/AP_Camera/AP_Camera.cpp
+++ b/libraries/AP_Camera/AP_Camera.cpp
@@ -26,7 +26,7 @@ const AP_Param::GroupInfo AP_Camera::var_info[] = {
     // @Param: DURATION
     // @DisplayName: Duration that shutter is held open
     // @Description: How long the shutter will be held open in 10ths of a second (i.e. enter 10 for 1second, 50 for 5seconds)
-    // @Units: seconds
+    // @Units: deciseconds
     // @Range: 0 50
     // @User: Standard
     AP_GROUPINFO("DURATION",    1, AP_Camera, _trigger_duration, AP_CAMERA_TRIGGER_DEFAULT_DURATION),