diff --git a/source/linear-algebra/source/04-MX/03.ptx b/source/linear-algebra/source/04-MX/03.ptx
index 582acd20e..ce5a873ea 100644
--- a/source/linear-algebra/source/04-MX/03.ptx
+++ b/source/linear-algebra/source/04-MX/03.ptx
@@ -79,7 +79,7 @@
                   x_2\begin{bmatrix}1\\-1\\1\end{bmatrix}+
                   x_3\begin{bmatrix}0\\1\\1\end{bmatrix}
                 </md>
-                <ol label="A." cols="3">
+                <ol marker="A." cols="3">
                   <li><p>Zero</p></li>
                   <li><p>At most one</p></li>
                   <li><p>Exactly one</p></li>
@@ -103,7 +103,7 @@
             If <m>\vec x=\left[\begin{array}{c}x_1\\x_2\\x_3\end{array}\right]</m>
             and <m>B = \left[\begin{array}{ccc}\vec b_1&amp; \vec b_2&amp;\vec b_3\end{array}\right]=\left[\begin{array}{ccc}1&amp;1&amp;0\\0&amp;-1&amp;1\\1&amp;1&amp;1\end{array}\right]</m>,
             which of these matrix equations can be used to find <m>x_1,x_2,x_3</m>?
-            <ol label="A." cols="3">
+            <ol marker="A." cols="3">
               <li><p><m>\vec v=B\vec x</m></p></li>
               <li><p><m>B\vec v=\vec x</m></p></li>
               <li><p><m>\vec v=B^{-1}\vec x</m></p></li>
diff --git a/source/linear-algebra/source/future-ON/01.ptx b/source/linear-algebra/source/future-ON/01.ptx
index cd5c34969..8528f87ee 100644
--- a/source/linear-algebra/source/future-ON/01.ptx
+++ b/source/linear-algebra/source/future-ON/01.ptx
@@ -23,7 +23,7 @@
             <p>
 Let <m>\vec v =\left[\begin{array}{c} 1 \\ -1 \\ 0 \\ 2 \\ 3 \end{array}\right]</m> and <m> \vec w=\left[\begin{array}{c} 5 \\ 12 \\ -1 \\ 1 \\ 2 \end{array}\right]</m>. What is <m>\vec v \circledast \vec w</m>?
             </p>
-    <ol label ="A.">
+    <ol marker ="A.">
 <li> <m>25</m></li>
 <li> <m>\left[\begin{array}{c} 5 \\ -12 \\ 0 \\ 2 \\ 6 \end{array}\right]</m></li>
 <li> <m>1</m></li>