Increase heading level

1 files changed, 6 insertions, 6 deletions

diff --git a/content/book-reviews/relevant-search.md b/content/book-reviews/relevant-search.md
index 23b7374..e46ac91 100644
--- a/content/book-reviews/relevant-search.md
+++ b/content/book-reviews/relevant-search.md
@@ -13,8 +13,8 @@ lang: en
 layout: books
 ---
 
-# Summary
-## The search relevance problem
+## Summary
+### The search relevance problem
 
 Given an increasingly large amount of information, it is infeasible for users
 to retrieve what they needed.  Relevance scoring is therefore essential for
@@ -33,7 +33,7 @@ Even the academic field that thoroughly study this problem, information
 retrieval is not a one-size-fit all solution.  Relevance is strongly tied with
 the field and the application purpose.
 
-## Tackling the problem
+### Tackling the problem
 
 The book approaches the problem first by a top-down analysis of how a typical
 search engine works.  It then shows how a search query is processed by the
@@ -44,9 +44,9 @@ authors also approach the problem from business view: they note that
 interdiscipline collaboration is important in order to define and increase
 relevance.
 
-# Comments
+## Comments
 
-## What I like
+### What I like
 
 The book approaches the problem from various views: business view, algorithmic
 view, and practical view (giving examples). The book accentuates the diversity
@@ -54,7 +54,7 @@ of problems and thereby encouraging readers to critically think of their own
 problems.  While it suggests that search results should be influenced by
 sponsors, it also notes that without balance that will as well lead to failure.
 
-## What I don't like
+### What I don't like
 
 Its structure is somewhat unclear and flow to me.  I think some chapters can be
 re-ordered so it's more logical.  Also, I find weighing sponsors' priorities