diff --git a/ch02_overview.adoc b/ch02_overview.adoc
index d658831f..4dbb29f0 100644
--- a/ch02_overview.adoc
+++ b/ch02_overview.adoc
@@ -501,7 +501,7 @@ However, once a winning combination has been found, anyone can verify
 the block is valid by running the hash function just once.  That makes a
 valid block something that requires an incredible amount of work to
 create but only a trivial amount of work to verify.  The simple
-verification process is able to probabalistically prove the work was
+verification process is able to probabilistically prove the work was
 done, so the data necessary to generate that proof--in this case, the
 block--is called((("proof-of-work algorithm"))) _proof of work (PoW)_.