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-rw-r--r--manual.md18
1 files changed, 16 insertions, 2 deletions
diff --git a/manual.md b/manual.md
index c3570d8..d4a8502 100644
--- a/manual.md
+++ b/manual.md
@@ -499,6 +499,22 @@ pile individually into whatever centrifuge is available: they must be
input in matched pairs. Any odd dust pile in a centrifuge will not be
processed and will prevent that centrifuge from accepting any other input.
+### concrete ###
+
+Concrete is a synthetic building material. The technic modpack implements
+it in the game.
+
+Two forms of concrete are available as building blocks: ordinary
+"concrete" and more advanced "blast-resistant concrete". Despite its
+name, the latter has no special resistance to explosions or to any other
+means of destruction.
+
+Concrete can also be used to make fences. They act just like wooden
+fences, but aren't flammable. Confusingly, the item that corresponds
+to a wooden "fence" is called "concrete post". Posts placed adjacently
+will implicitly create fence between them. Fencing also appears between
+a post and adjacent concrete block.
+
industrial processes
--------------------
@@ -784,8 +800,6 @@ subjects missing from this manual
This manual needs to be extended with sections on:
-* substances
- * concrete
* powered machines
* machine upgrades
* how machines interact with tubes