diff --git a/hledger-lib/hledger_csv.m4.md b/hledger-lib/hledger_csv.m4.md
index a7df0cf72..2025a71f7 100644
--- a/hledger-lib/hledger_csv.m4.md
+++ b/hledger-lib/hledger_csv.m4.md
@@ -540,6 +540,8 @@ Conditional blocks ("if blocks") are a block of rules that are applied
 only to CSV records which match certain patterns. They are often used
 for customising account names based on transaction descriptions.
 
+### Matching the whole record
+
 Each MATCHER can be a record matcher, which looks like this:
 ```rules
 REGEX
@@ -557,6 +559,8 @@ with any enclosing double quotes (but not enclosing whitespace) removed, and alw
 Eg, if the original record is `2020-01-01; "Acme, Inc.";  1,000`,
 the REGEX will actually see   `2020-01-01,Acme, Inc.,  1,000`).
 
+### Matching individual fields
+
 Or, MATCHER can be a field matcher, like this:
 ```rules
 %CSVFIELD REGEX
@@ -564,6 +568,8 @@ Or, MATCHER can be a field matcher, like this:
 which matches just the content of a particular CSV field.
 CSVFIELD is a percent sign followed by the field's name or column number, like `%date` or `%1`.
 
+### Combining matchers
+
 A single matcher can be written on the same line as the "if";
 or multiple matchers can be written on the following lines, non-indented.
 Multiple matchers are OR'd (any one of them can match), unless one begins with
@@ -576,6 +582,8 @@ MATCHER
  RULE
 ```
 
+### Rules applied on successful match
+
 After the patterns there should be one or more rules to apply, all
 indented by at least one space. Three kinds of rule are allowed in
 conditional blocks: