diff --git a/inputs/tutorial_15.tex b/inputs/tutorial_15.tex
index 799bc5c..72b0d6c 100644
--- a/inputs/tutorial_15.tex
+++ b/inputs/tutorial_15.tex
@@ -71,7 +71,7 @@ so is $f(\cB)$.
 \end{fact}
 \begin{proof}
     Consider $(f,g)^{-1}(\Delta) \supseteq A$.
-    The RHS is a dense closed set, i.e.~the entire space.
+    The LHS is a dense closed set, i.e.~the entire space.
 \end{proof}
 
 We can uniquely extend a continuous $f\colon  X \to  Y$