diff --git a/exercises/e3.tex b/exercises/e3.tex
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--- a/exercises/e3.tex
+++ b/exercises/e3.tex
@@ -27,7 +27,7 @@
     $$
     P(a,b) = P(b)P(a\mid b) = P(a)P(b\mid a)
     $$ 
-    from which \thighlight{Baye's formula} is derived as
+    from which \thighlight{Bayes' formula} is derived as
     $$
     P(a\mid b) = \dfrac{P(b\mid a)P(a)}{P(b)}
     $$
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