diff --git a/mba-main.org b/mba-main.org
index d686c2e..b99e8b3 100644
--- a/mba-main.org
+++ b/mba-main.org
@@ -57,3 +57,6 @@
 ** Section 10 - Due Diligence and Data Sources
 #+attr_html: :class contents-overview
 - [[./mba/ch55.org][Chapter 55. Where to get Information for your Financial Model]]
+
+** Section 11 - Modeling and Valuation
+- [[./mba/ch58.org][Chapter 58. How to Build a Financial Model for a Public Company]]
diff --git a/mba/ch55.org b/mba/ch55.org
index bbfe31b..f31f7a1 100644
--- a/mba/ch55.org
+++ b/mba/ch55.org
@@ -24,6 +24,8 @@ bc the entire economy was crashing
 ** tech model
 - subscribers or license revenues
 - bookings
+  - recognize revenue when you ship the product and they pay you
+  - but a lot of this hasn't been paid yet.
 - operating and gross margin trends
 
 *** tech model bs
diff --git a/mba/ch58.org b/mba/ch58.org
new file mode 100644
index 0000000..2402555
--- /dev/null
+++ b/mba/ch58.org
@@ -0,0 +1,8 @@
+#+title: Section 11 | Lesson 58 - How to Build a Financial Model for a Public Company
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../_share/media/css/org-media-sass/categories/business.css" />
+
+* Links
+- [[./../mba-main.org][TOC | Business]]
+- [[https://www.udemy.com/course/an-entire-mba-in-1-courseaward-winning-business-school-prof/learn/lecture/4315002#overview][S11:L58 course video]]
+
+* Notes