--- src/object1.c.orig	2010-08-01 04:28:32.000000000 -0400
+++ src/object1.c	2010-11-16 19:57:46.000000000 -0500
@@ -2928,6 +2928,39 @@
 }
 
 /*
+ * Describe damage and range of a thrown boulder
+ */
+void display_boulder_damage(object_type *o_ptr)
+{
+	int boulder_add = get_skill_scale(SKILL_BOULDER, 80);
+	int boulder_mult = get_skill_scale(SKILL_BOULDER, 6);
+	int mul = 10 + (2 * (p_ptr->throw_mult - 1)) + (2 * boulder_mult);
+	int div = ((o_ptr->weight > 10) ? o_ptr->weight : 10);
+	int tdam, tdis;
+
+	tdam = (o_ptr->dd + (o_ptr->dd * o_ptr->ds)) * 5;
+	tdam += (o_ptr->to_d + boulder_add) * 10;
+	tdam *= p_ptr->throw_mult + boulder_mult;
+
+	tdis = (adj_str_blow[p_ptr->stat_ind[A_STR]] + 20) * mul / div;
+	if (tdis > mul) tdis = mul;
+
+	text_out("\nUsing it you would do an average damage per throw of ");
+	if (tdam > 0)
+	{
+		if (tdam % 10)
+			text_out_c(TERM_L_GREEN, format("%d.%d", tdam / 10, tdam % 10));
+		else
+			text_out_c(TERM_L_GREEN, format("%d", tdam / 10));
+	}
+	else
+		text_out_c(TERM_L_RED, "0");
+	text_out(" with a range of ");
+	text_out_c(TERM_L_GREEN, format("%d", tdis));
+	text_out(".");
+}
+
+/*
  * Describe a magic stick powers
  */
 void describe_device(object_type *o_ptr)
@@ -3913,6 +3946,14 @@
 				display_ammo_damage(o_ptr);
 			}
 
+			/* Breakage/damage/range display for boulders */
+			if ((o_ptr->tval == TV_JUNK) && (o_ptr->sval == SV_BOULDER) && (get_skill(SKILL_BOULDER)))
+			{
+				text_out("\nIt has ");
+				text_out_c(TERM_L_RED, format("%d", breakage_chance(o_ptr)));
+				text_out("% chance to break upon hit.");
+				display_boulder_damage(o_ptr);
+			}
 			/* Monster recall for totems and corpses */
 			if (o_ptr->tval == TV_TOTEM)
 			{