diff --git a/.obsidian/plugins/obsidian-excalidraw-plugin/data.json b/.obsidian/plugins/obsidian-excalidraw-plugin/data.json
index aa002f2..d423a07 100644
--- a/.obsidian/plugins/obsidian-excalidraw-plugin/data.json
+++ b/.obsidian/plugins/obsidian-excalidraw-plugin/data.json
@@ -111,7 +111,7 @@
   "library2": {
     "type": "excalidrawlib",
     "version": 2,
-    "source": "https://github.com/zsviczian/obsidian-excalidraw-plugin/releases/tag/2.16.1",
+    "source": "https://github.com/zsviczian/obsidian-excalidraw-plugin/releases/tag/2.18.3",
     "libraryItems": []
   },
   "imageElementNotice": true,
diff --git a/ambiguity-in-construction-estimating.md b/ambiguity-in-construction-estimating.md
index 0ed707c..71f2f15 100644
--- a/ambiguity-in-construction-estimating.md
+++ b/ambiguity-in-construction-estimating.md
@@ -25,11 +25,12 @@ and undoing years of poor conditioning is... not easy.
 
 ## Naming Conventions (Use Case vs. Description)
 
-Related: [[realism-vs-instrumentalism]]
+Related topic: [[realism-vs-instrumentalism]]
 
 Naming by use case is intuitive for those without estimating or field experience,
 but has the side effect that those accustomed to the names
-will inevitably _treat them as descriptive_.
+will inevitably _treat them as descriptive_,
+leading to [[ambiguity#Category Mistake|category mistake]].
 
 | Use Case            | Description   |
 | ------------------- | ------------- |
diff --git a/markup-vs-margin.md b/markup-vs-margin.md
index b72b7d5..87a0471 100644
--- a/markup-vs-margin.md
+++ b/markup-vs-margin.md
@@ -11,6 +11,10 @@ title: Markup vs. Margin
 ---
 # Markup vs. Margin
 
+**Markup** and **margin** are both terms to describe the percent profit of a sold good or service.
+**Markup** describes an item's profit relative to its cost to the merchant.
+**Margin** describes an item's profit relative to its cost to the customer.
+
 $$
 \text{Profit} = \text{Sell Price} - \text{Cost}, \quad
 \text{Markup} = \frac{\text{Profit}}{\text{Cost}}, \quad
@@ -31,4 +35,4 @@ Because of \*waves hands\* finance reasons,
 contractors (and sellers of products and services in general)
 almost exclusively talk about profit in terms of margin.
 Even if someone says "15% _markup_"
-they're still probably talking about margin.
+they may still be talking about margin.
diff --git a/supertopics.md b/supertopics.md
index d6a8ec3..b35db0c 100644
--- a/supertopics.md
+++ b/supertopics.md
@@ -33,7 +33,7 @@ Each supertopic note will be linked as below.
 
 %%
 
-## Risk-Oriented-Estimating
+## Risk-Oriented Estimating
 
 Main article: [[risk-oriented-estimating]]
 
diff --git a/the-book-of-the-new-sun.md b/the-book-of-the-new-sun.md
index 6cd116c..0b4862c 100644
--- a/the-book-of-the-new-sun.md
+++ b/the-book-of-the-new-sun.md
@@ -434,19 +434,22 @@ and/or from spending time near larger gravity wells.
 
 Also a spacefarer
 
-### Ymar
+### The Previous Autarch
+
+Severian's unnamed predecessor to the autarchy.
+He is not Ymar, but Ymar's successor.
 
-Severian's predecessor to the autarchy.
 He takes several forms in Severian's narrative
 before they meet in truth.
 
-Master Rudesind, the painting cleaner
-at the Citadel and then the House Absolute
-Maybe?
+* Master Rudesind, the painting cleaner
+    at the Citadel and then the House Absolute
+    Maybe? No.
+    Confused with the unnamed clerk of the House Absolute.
 
-The proprietor of the House Azure
-who is also [[#Vodalus]]'s contact
-in the House Absolute
+* The proprietor of the House Azure
+    who is also [[#Vodalus]]'s contact
+    in the House Absolute
 
 ## Creatures
 
diff --git a/uncertainty-in-construction-estimating.md b/uncertainty-in-construction-estimating.md
index 481e37f..9c0b5c7 100644
--- a/uncertainty-in-construction-estimating.md
+++ b/uncertainty-in-construction-estimating.md
@@ -53,10 +53,10 @@ as reported in the winning contractor's historicals.
 
 an organization pays in estimator hours.
 These hours have a direct cost in salary and benefits,
-however the greater cost is the opportunity cost
+however the greater cost is the **opportunity cost**
 of tying up an estimator who could otherwise be starting a new project.
 
-In many cases, the utility of doubled throughput
+In many cases, the [[utility]] of doubled throughput
 far outweighs the increased risk of individual bids.
 
 %%
\ No newline at end of file