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-rw-r--r--src/doc/unstable-book/src/const-indexing.md9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/doc/unstable-book/src/const-indexing.md b/src/doc/unstable-book/src/const-indexing.md
index bd92b0b1b47..42d46ce15f6 100644
--- a/src/doc/unstable-book/src/const-indexing.md
+++ b/src/doc/unstable-book/src/const-indexing.md
@@ -6,5 +6,14 @@ The tracking issue for this feature is: [#29947]
 
 ------------------------
 
+The `const_indexing` feature allows the constant evaluation of index operations
+on constant arrays and repeat expressions.
 
+## Examples
 
+```rust
+#![feature(const_indexing)]
+
+const ARR: [usize; 5] = [1, 2, 3, 4, 5];
+const ARR2: [usize; ARR[1]] = [42, 99];
+```
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