diff --git a/README.md b/README.md
index bf7c4cd..eaa0603 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ They will hold the water away until they are removed.
 This will cause them to become soggy, so to use them again they have to be cooked.
 
 ### How it works:
-* Sponges create a 9x9 area of air-like nodes that water can't flow through (checks for protection).
+* Sponges create a 9x9x9 cube of air-like nodes that water can't flow through (checks for protection).
 * If sponges have cleared more than 3 nodes of liquid, they become soggy sponges.
-* Removing a sponge or soggy sponge will turn a 9x9 area of air-like nodes back into air, as long as they are not in the area of another sponge.
+* Removing a sponge or soggy sponge will turn a 9x9x9 cube of air-like nodes back into air, as long as they are not in the area of another sponge.
 *(Air-like nodes can be removed in protection by removing a sponge outside the protection, they are not meant to be permanent)*