diff --git a/README.asc b/README.asc
index f48ca301..77255182 100644
--- a/README.asc
+++ b/README.asc
@@ -104,9 +104,9 @@ The general rules go as follows:
 === Levels
 
 Levels for Phase 1 and Phase 2 should be compatible with Boom 2.02: a
-Doom-derived engine which is a common ancester for many engines
+Doom-derived engine which is a common ancestor for many engines
 today. Its extensions are even commonly reimplemented by engines which
-are not decended from Boom. This means that you may exceed the limits
+are not descended from Boom. This means that you may exceed the limits
 of vanilla Doom and use features introduced in Boom. However, do not
 use features that are not supported by Boom 2.02 and compatible
 engines. Levels should be in Doom's original format, not in