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diff --git a/crawl-ref/source/terrain.h b/crawl-ref/source/terrain.h
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+/*
+ *  File:       terrain.h
+ *  Summary:    Terrain related functions.
+ *  Written by: Linley Henzell
+ *
+ *  Modified for Crawl Reference by $Author: j-p-e-g $ on $Date: 2007-09-03 06:41:30 -0700 (Mon, 03 Sep 2007) $
+ *
+ *  Change History (most recent first):
+ *
+ *               <1>     9/11/07        MPC             Split from misc.h
+ */
+
+#ifndef TERRAIN_H
+#define TERRAIN_H
+
+#include "enum.h"
+
+class coord_def;
+
+// last updated 12may2000 {dlb}
+/* ***********************************************************************
+ * called from: acr
+ * *********************************************************************** */
+bool fall_into_a_pool( int entry_x, int entry_y, bool allow_shift, 
+                       unsigned char terrain );
+
+
+bool grid_is_wall(dungeon_feature_type grid);
+bool grid_is_opaque(dungeon_feature_type grid);
+bool grid_is_solid(dungeon_feature_type grid);
+bool grid_is_stone_stair(dungeon_feature_type grid);
+bool grid_is_rock_stair(dungeon_feature_type grid);
+bool grid_is_solid(int x, int y);
+bool grid_is_solid(const coord_def &c);
+bool grid_is_trap(dungeon_feature_type grid);
+command_type grid_stair_direction(dungeon_feature_type grid);
+bool grid_sealable_portal(dungeon_feature_type grid);
+bool grid_is_portal(dungeon_feature_type grid);
+
+bool grid_is_water(dungeon_feature_type grid);
+bool grid_is_watery(dungeon_feature_type grid);
+god_type grid_altar_god( dungeon_feature_type grid );
+dungeon_feature_type altar_for_god( god_type god );
+bool grid_is_branch_stairs( dungeon_feature_type grid );
+int grid_secret_door_appearance( int gx, int gy );
+bool grid_destroys_items( dungeon_feature_type grid );
+
+const char *grid_item_destruction_message( dungeon_feature_type grid );
+
+// Terrain changed under 'pos', perform necessary effects.
+void dungeon_terrain_changed(const coord_def &pos,
+                             dungeon_feature_type feat = DNGN_UNSEEN,
+                             bool affect_player = true,
+                             bool preserve_features = false,
+                             bool preserve_items = false);
+
+#endif