diff --git a/README.markdown b/README.markdown
index 0763422..c289c2d 100644
--- a/README.markdown
+++ b/README.markdown
@@ -62,7 +62,7 @@ the `rand()` function with a fixed seed.
 What it does not:
 -----------------
 
-It doesn't support DNSSec, it doesn't send anything using TCP, it
+It doesn't support DNSSEC, it doesn't send anything using TCP, it
 doesn't pay attention to the content the resolver sents.
 
 Fuzzing: