diff --git a/src/en/clean-copy/04-Section III. The API Product/02.md b/src/en/clean-copy/04-Section III. The API Product/02.md
index 61f1b6c..3c07e9d 100644
--- a/src/en/clean-copy/04-Section III. The API Product/02.md	
+++ b/src/en/clean-copy/04-Section III. The API Product/02.md	
@@ -1,4 +1,4 @@
-### API Business Models
+### The API Business Models
 
 Before we proceed to the API product management principles description, let us draw your attention to the issue of profits that companies providing APIs might extract from it. As we will demonstrate in the next chapters, this issue directly affects making product decisions and setting KPIs for the API team. [In brackets, we will provide examples of such models applicable to our coffee-machine API study.]
 
diff --git a/src/en/clean-copy/04-Section III. The API Product/06.md b/src/en/clean-copy/04-Section III. The API Product/06.md
index afa4195..2a9a009 100644
--- a/src/en/clean-copy/04-Section III. The API Product/06.md	
+++ b/src/en/clean-copy/04-Section III. The API Product/06.md	
@@ -1,4 +1,4 @@
-### API Services Range
+### The API Services Range
 
 The important rule of API product management that any major API provider will soon learn formulates like that: there is no sense to ship one specific API; there is always a room for a range of products, and this range is two-dimensional.
 
diff --git a/src/en/clean-copy/04-Section III. The API Product/07.md b/src/en/clean-copy/04-Section III. The API Product/07.md
index 015f52e..ccbe86d 100644
--- a/src/en/clean-copy/04-Section III. The API Product/07.md	
+++ b/src/en/clean-copy/04-Section III. The API Product/07.md	
@@ -1,4 +1,4 @@
-### API Key Performance Indicators
+### The API Key Performance Indicators
 
 As we described in the previous chapters, there are many API monetization models, both direct and indirect. Importantly, most of them are fully or conditionally free for partners, and the direct to indirect benefits ratio tends to change during the API lifecycle. That naturally leads us to the question of how exactly shall we measure the API success and what goals are to be set for the product team.
 
diff --git a/src/en/clean-copy/04-Section III. The API Product/09.md b/src/en/clean-copy/04-Section III. The API Product/09.md
index 7d89180..de91c90 100644
--- a/src/en/clean-copy/04-Section III. The API Product/09.md	
+++ b/src/en/clean-copy/04-Section III. The API Product/09.md	
@@ -1,4 +1,4 @@
-### Technical Means of Preventing ToS Violations
+### The Technical Means of Preventing ToS Violations
 
 Implementing the paradigm of a centralized system of preventing partner endpoints-bound fraud, which we described in the previous chapter, in practice faces non-trivial difficulties.