diff --git a/src/landscape.cpp b/src/landscape.cpp
--- a/src/landscape.cpp
+++ b/src/landscape.cpp
@@ -594,6 +594,8 @@ void ClearSnowLine()
  * @param flags of operation to conduct
  * @param p1 unused
  * @param p2 unused
+ * @param text unused
+ * @return the cost of this operation or an error
  */
 CommandCost CmdLandscapeClear(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 {
@@ -605,6 +607,8 @@ CommandCost CmdLandscapeClear(TileIndex 
  * @param p1 start tile of area dragging
  * @param flags of operation to conduct
  * @param p2 unused
+ * @param text unused
+ * @return the cost of this operation or an error
  */
 CommandCost CmdClearArea(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 {