diff --git a/317-Construct-map-region.mediawiki b/317-Construct-map-region.mediawiki
new file mode 100644
index 0000000..2f0c0ff
--- /dev/null
+++ b/317-Construct-map-region.mediawiki
@@ -0,0 +1,43 @@
+[[Category Packet]]
+[[Category Packet 317]]
+{{packet|name=Construct map region|description=Constructs a new map region from a palette of 8x8 tiles.|opcode=241|type=Variable Short|length=N/A|revision=317}}
+== Construct Map Region ==
+
+=== Description ===
+
+The construct map region packet sends a dynamic map region that is constructed by using groups of 8*8 tiles. It is generally used for instanced areas, such as fight caves, and in later revisions, player owned houses.
+
+=== Packet Structure ===
+
+{| border=2
+! Data type
+! Description
+|-
+| [[Data Types#Standard data types|Short]] [[Data Types#Non Standard Data Types|Special A]]
+| The region Y coordinate (absolute Y coordinate / 8), plus 6.
+|-
+| [[#Bit block|Bit block]]
+| See below.
+|-
+| [[Data Types#Standard data types|Short]]
+| The region X coordinate (absolute X coordinate / 8), plus 6.
+|}
+
+==== Bit block ====
+
+The bit block actually contains the 'palette' of map regions to make up the new region.
+
+There is a loop, like this, used to construct it:
+
+ for(int z = 0; z < 4; z++) {
+  for(int x = 0; x < 13; x++) {
+   for(int y = 0; y < 13; y++) {
+    // data for this region
+   }
+  }
+ }
+
+The individual format in each iteration of the loop is:
+
+* '''1 bit''' - set to 0 to indicate to display nothing, 1 to display a region
+* '''26 bits''' - if the flag above is set to 1 - region x << 14 | region y << 3
\ No newline at end of file
diff --git a/Categories.mediawiki b/Categories.mediawiki
index 00e33ae..f0a19e3 100644
--- a/Categories.mediawiki
+++ b/Categories.mediawiki
@@ -1,9 +1,9 @@
 <!-- DO NOT EDIT THIS FILE, CODE AUTOMATICALLY GENERATED BY category.sh -->
 The following categories contain pages or media.
 * [[Category Data Type]] (3 members)
-* [[Category Packet]] (26 members)
+* [[Category Packet]] (27 members)
 * [[Category Packet 194]] (1 members)
-* [[Category Packet 317]] (23 members)
+* [[Category Packet 317]] (24 members)
 * [[Category Packet 474]] (1 members)
 * [[Category Packet {{{revision}}}]] (1 members)
 * [[Category RS2]] (4 members)
diff --git a/Category-Packet-317.mediawiki b/Category-Packet-317.mediawiki
index 178b168..98ece6e 100644
--- a/Category-Packet-317.mediawiki
+++ b/Category-Packet-317.mediawiki
@@ -1,11 +1,12 @@
 <!-- DO NOT EDIT BELOW THIS LINE, OR CHANGE THIS COMMENT, CODE AUTOMATICALLY GENERATED BY category.sh -->
 == '''Pages in category "Packet 317"''' ==
-The following 23 pages are in this category.
+The following 24 pages are in this category.
 * [[317 Animation reset]]
 * [[317 Camera shake]]
 * [[317 Chat interface]]
 * [[317 Chat settings]]
 * [[317 Clear screen]]
+* [[317 Construct map region]]
 * [[317 Flash sidebar]]
 * [[317 Friends list status]]
 * [[317 Interface color]]
diff --git a/Category-Packet.mediawiki b/Category-Packet.mediawiki
index 133c0a3..195c7c9 100644
--- a/Category-Packet.mediawiki
+++ b/Category-Packet.mediawiki
@@ -1,12 +1,13 @@
 <!-- DO NOT EDIT BELOW THIS LINE, OR CHANGE THIS COMMENT, CODE AUTOMATICALLY GENERATED BY category.sh -->
 == '''Pages in category "Packet"''' ==
-The following 26 pages are in this category.
+The following 27 pages are in this category.
 * [[194 Protocol]]
 * [[317 Animation reset]]
 * [[317 Camera shake]]
 * [[317 Chat interface]]
 * [[317 Chat settings]]
 * [[317 Clear screen]]
+* [[317 Construct map region]]
 * [[317 Flash sidebar]]
 * [[317 Friends list status]]
 * [[317 Interface color]]