Add subsections for configuration chapter (#787)

1 files changed, 4 insertions, 0 deletions

diff --git a/book/src/configuration.md b/book/src/configuration.md
index abf276d..6e8d581 100644
--- a/book/src/configuration.md
+++ b/book/src/configuration.md
@@ -15,6 +15,8 @@ dirs = ["templates"]
 whitespace = "preserve"
 ```
 
+## Whitespace control
+
 In the default configuration, you can use the `-` operator to indicate that
 whitespace should be suppressed before or after a block. For example:
 
@@ -55,6 +57,8 @@ character remaining will be a newline.
 If you want this to be the default behaviour, you can set `whitespace` to
 `"minimize"`.
 
+## Custom syntaxes
+
 Here is an example that defines two custom syntaxes:
 
 ```toml