diff --git a/book/notebooks/Introductory/probability-integral-transform.ipynb b/book/notebooks/Introductory/probability-integral-transform.ipynb
index c8f60d0..b6d0bd1 100644
--- a/book/notebooks/Introductory/probability-integral-transform.ipynb
+++ b/book/notebooks/Introductory/probability-integral-transform.ipynb
@@ -57,7 +57,7 @@
     "\\begin{split}\n",
     "F_{Y}(y) &= \\text{P}(Y \\leq y)\\\\\n",
     " &= \\text{P}(F_{X}(X) \\leq y) \\\\\n",
-    " &= \\text{P}(F_{X}(X) \\leq F_{X}^{-1}(y)) \\\\\n",
+    " &= \\text{P}(X \\leq F_{X}^{-1}(y)) \\\\\n",
     " &= F_{X}(F_{X}^{-1}(y)) \\\\\n",
     " &= y.\n",
     "\\end{split}\n",