fix grammar in a comment

diff --git a/hostside/safety.c b/hostside/safety.c
index 926b21b2b840148360206e551f06ae7df095085f..a8b2abd4656296d9c68cd42f549200456d397e01 100644 (file)
--- a/hostside/safety.c
+++ b/hostside/safety.c
@@ -31,7 +31,7 @@ Segment *segments;
  * foredetect and one for each end of our train.  This represents a
  * predicted train position.  (We use `predicted' to refer to these
  * future situations and `current' to refer to that prevailing at the
- * time we are making the prediction.)  The advancement is driving
+ * time we are making the prediction.)  The advancement is driven
  * using the foredetect; when it enters a new segment we advance first
  * the head and then the tail by the same distance.
  *