diff --git a/API.txt b/API.txt
index 7190b52..b6c4173 100644
--- a/API.txt
+++ b/API.txt
@@ -534,21 +534,29 @@ Humidity Mapping
 
 Last but not least is a moisture/humidity map.  Like the temperature map
 above, Perlin values can be tested to determine the approximate humidity of
-the *air* in the area.
+the *air* in the area.  This humidity map is basically the perlin layer used
+for deserts.
 
-A value of -1 equates to 100% humidity (basically, it would be a thick fog
-if it could be seen),  a value of 0 is 50%, and a value of +1 is 0% (dry as a
-bone).
+A value of -1.0 is very moist (basically a thick fog, if it could be seen), a
+value of +0.4 represents the edge of a desert as usually seen in the game, and
+a value of +1.0 is as dry as a bone.
 
-This does not check for nearby water or desert area, just general air
-humidity, and that being the case, nearby ground does not affect the
-reported humidity of a region (because this isn't yet possible to calculate
-yet).
+This does not check for nearby water, just general air humidity, and that
+being the case, nearby ground does not affect the reported humidity of a
+region (because this isn't yet possible to calculate yet).  Use the near_nodes
+and avoid_nodes parameters and their related options to check for water and
+such.
 
 The Perlin values use for this layer are:
 
-humidity_seeddiff = 1234
-humidity_octaves = 1
-humidity_persistence = 0.5
-humidity_scale = 150
+	humidity_seeddiff = 9130
+	humidity_octaves = 3
+	humidity_persistence = 0.5
+	humidity_scale = 250
+
+And this particular one is mapped slightly differently from the others:
+
+	noise3 = perlin3:get2d({x=p_top.x+150, y=p_top.z+50})
+
+(Note the +150 and +50 offsets)
 
diff --git a/plants_lib/init.lua b/plants_lib/init.lua
index 183f609..870c084 100644
--- a/plants_lib/init.lua
+++ b/plants_lib/init.lua
@@ -24,10 +24,10 @@ local temperature_octaves = 3
 local temperature_persistence = 0.5
 local temperature_scale = 150
 
-local humidity_seeddiff = 1234
-local humidity_octaves = 1
+local humidity_seeddiff = 9130
+local humidity_octaves = 3
 local humidity_persistence = 0.5
-local humidity_scale = 150
+local humidity_scale = 250
 
 -- Local functions
 
@@ -89,7 +89,7 @@ function plantslib:search_for_surfaces(minp, maxp, biomedef, node_or_function_or
 			local perlin3 = minetest.env:get_perlin(humidity_seeddiff, humidity_octaves, humidity_persistence, humidity_scale)
 			local noise1 = perlin1:get2d({x=p_top.x, y=p_top.z})
 			local noise2 = perlin2:get2d({x=p_top.x, y=p_top.z})
-			local noise3 = perlin3:get2d({x=p_top.x, y=p_top.z})
+			local noise3 = perlin3:get2d({x=p_top.x+150, y=p_top.z+50})
 			if (biome.depth == nil or minetest.env:get_node({ x = pos.x, y = pos.y-biome.depth-1, z = pos.z }).name ~= biome.surface)
 			  and minetest.env:get_node(p_top).name == "air" 
 			  and pos.y >= biome.min_elevation