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-rw-r--r--crawl-ref/docs/level-design.txt23
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diff --git a/crawl-ref/docs/level-design.txt b/crawl-ref/docs/level-design.txt
index 1c894dfc6e..4914025362 100644
--- a/crawl-ref/docs/level-design.txt
+++ b/crawl-ref/docs/level-design.txt
@@ -10,6 +10,7 @@ Contents: A. Introduction
G. Hints for level makers
H. Lua reference
I. Feature names
+ J. Map statistics
A. Introduction
-----------------
@@ -1172,3 +1173,25 @@ altar_elyvilon, altar_lugonu, altar_beogh, blue_fountain,
dry_fountain_i, sparkling_fountain, dry_fountain_ii, dry_fountain_iii,
dry_fountain_iv, dry_fountain_v, dry_fountain_vi, dry_fountain_vii,
dry_fountain_viii, permadry_fountain
+
+
+J. Map Statistics
+-------------------
+
+Full-debug Crawl builds (this does not include normal Crawl builds
+that have wizard-mode) can produce map generation statistics. To
+generate statistics, run crawl from the command-line as:
+
+crawl -mapstat
+
+This will generate 100 Crawl dungeons and report on the maps used in a
+file named "mapgen.log" in the working directory.
+
+You can change the number of dungeons to generate:
+
+crawl -mapstat 10
+
+Will generate 10 dungeons. If you merely want statistics on the
+probabilities of the levels, use:
+
+crawl -mapstat 1