diff --git a/courses/ISYE-2210.html b/courses/ISYE-2210.html
index 07f10c2a9..23736b98b 100644
--- a/courses/ISYE-2210.html
+++ b/courses/ISYE-2210.html
@@ -46,9 +46,7 @@
             Prereqs:
           </div>
           <div id="prereq-classes" class="rel-info-courses">
-            <span class="none-rect">
-              none
-            </span>
+            <a class="course-pill" href="MATH-1020">MATH-1020 Calculus II</a>
           </div>
         </div>
       </div>
diff --git a/courses/ISYE-4140.html b/courses/ISYE-4140.html
index 88c156589..b8f4e57cf 100644
--- a/courses/ISYE-4140.html
+++ b/courses/ISYE-4140.html
@@ -46,9 +46,15 @@
             Prereqs:
           </div>
           <div id="prereq-classes" class="rel-info-courses">
-            <span class="none-rect">
-              none
-            </span>
+            <div class="pr-or-con">
+              <div class="pr-or-title">
+                one of:
+              </div>
+              <div class="pr-or">
+                <a class="course-pill" href="ENGR-2600">ENGR-2600 Modeling and Analysis of Uncertainty</a>
+                <a class="course-pill" href="MATP-4600">MATP-4600 Probability Theory and Applications</a>
+              </div>
+            </div>
           </div>
         </div>
       </div>