Add comment about internal representation

diff --git a/src/System/IO/LineIndexedCursor.hs b/src/System/IO/LineIndexedCursor.hs
index f7200383929e75b9bf63c04b6a265f61459cffe2..f7a26b35c3de10d32ab57db0600d1604fec54779 100644 (file)
--- a/src/System/IO/LineIndexedCursor.hs
+++ b/src/System/IO/LineIndexedCursor.hs
@@ -10,6 +10,10 @@
 --
 -- Lazily builds the index with the line numbers while reading the file
 -- making it possible to rewind to them quickly later.
+--
+-- The indices are stored using a list, with a fixed length capacity, and 'Data.Array'.
+-- Each new element is added to the list and when the capacity is reached, the list items get flushed
+-- to the array for faster access. The list's capacity can be configured using 'mkLineIndexedCursorWithCapacity'.
 -----------------------------------------------------------------------------
 
 module System.IO.LineIndexedCursor