diff --git a/4.1-Extensions.md b/4.1-Extensions.md
index c252bc7..216a761 100644
--- a/4.1-Extensions.md
+++ b/4.1-Extensions.md
@@ -89,4 +89,4 @@ If you don't use RFP, then **you're on your own**. And don't rely on entropy fig
    * e.g.: why are 1 in 1.85 (54%) results returning no plugins, when chrome (at 67% market share) and others by default reveal plugin data
    * remember: very, very, very few users use anti-fingerprinting measures
 
-It takes large real world studies to get the number of results per metric, and it takes a controlled one (one result per browser) to get the distribution in order to get relliable entropy figures. Don't believe the BS.
+It takes large real world studies to get the number of results per metric, and it takes a controlled one (one result per browser) to get the distribution in order to get reliable entropy figures. Don't believe the BS.