Update a comment.
diff --git a/include/jemalloc/internal/arena.h b/include/jemalloc/internal/arena.h
index 28d63c6..ad40083 100644
--- a/include/jemalloc/internal/arena.h
+++ b/include/jemalloc/internal/arena.h
@@ -165,7 +165,7 @@
* perspective:
* 1) Thread assignment (modifies nthreads) is synchronized via atomics.
* 2) Bin-related operations are protected by bin locks.
- * 3) Chunk-related operations are protected by this mutex.
+ * 3) Extent-related operations are protected by this mutex.
*/
malloc_mutex_t lock;
