diff --git a/src/tunnelbridge_cmd.cpp b/src/tunnelbridge_cmd.cpp
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -440,7 +440,7 @@ not_valid_below:;
 
 
 /** Build Tunnel.
- * @param tile start tile of tunnel
+ * @param start_tile start tile of tunnel
  * @param flags type of operation
  * @param p1 railtype, 0x200 for road tunnel
  * @param p2 unused