Add some explanatory comments

1 files changed, 5 insertions, 0 deletions

diff --git a/dhall_core/src/parser.rs b/dhall_core/src/parser.rs
index 357d006..b0741ed 100644
--- a/dhall_core/src/parser.rs
+++ b/dhall_core/src/parser.rs
@@ -8,6 +8,11 @@ use dhall_parser::{DhallParser, Rule};
 use crate::core;
 use crate::core::*;
 
+// This file consumes the parse tree generated by pest and turns it into
+// our own AST. All those custom macros should eventually moved into
+// their own crate because they are quite general and useful. For now they
+// are here and hopefully you can figure out how they work.
+
 pub type ParsedExpr = Expr<X, Import>;
 pub type BoxExpr = Box<ParsedExpr>;