Rearrange documentation index somewhat

1 files changed, 12 insertions, 12 deletions

diff --git a/doc/README.md b/doc/README.md
index c9844b7c..7d0a1fd4 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -19,23 +19,23 @@ References:
 - [BQN as combinatory logic](birds.md)
 
 Concepts:
-- [Context-free grammar](context.md)
 - [Expression syntax](expression.md)
+  - [Context-free grammar](context.md)
 - [Arrays](array.md)
-- [Based array theory](based.md)
-- [Array notation and display](arrayrepr.md)
-- [Array indices](indices.md)
-- [Fill elements](fill.md)
-- [The leading axis model](leading.md)
+  - [Based array theory](based.md)
+  - [Array notation and display](arrayrepr.md)
+  - [Array indices](indices.md)
+  - [Fill elements](fill.md)
+  - [The leading axis model](leading.md)
 - [Functions and modifiers](ops.md)
+  - [Functional programming](functional.md)
 - [Tacit programming](tacit.md)
-- [Function trains](train.md)
+  - [Function trains](train.md)
 - [Blocks](block.md)
-- [Lexical scoping](lexical.md)
-- [Functional programming](functional.md)
-- [Control flow](control.md)
+  - [Lexical scoping](lexical.md)
+  - [Control flow](control.md)
 - [Namespaces](namespace.md)
-- [Object-oriented programming](oop.md)
+  - [Object-oriented programming](oop.md)
 
 Primitives:
 - [Arithmetic: `+-×÷⋆√⌊⌈|≤<>≥=≠`](arithmetic.md)
@@ -56,8 +56,8 @@ Primitives:
 - [Indices and Replicate: `/`](replicate.md)
 - [Join and Join To: `∾`](join.md)
 - [Logical functions: `∧∨¬`](logic.md)
-- [Match: `≡≢`](match.md)
 - [Mapping: `¨⌜`](map.md)
+- [Match: `≡≢`](match.md)
 - [Ordering functions: `∧∨⍋⍒`](order.md)
 - [Pair: `⋈`](pair.md)
 - [Pick: `⊑`](pick.md)