diff --git a/ast/ast.go b/ast/ast.go
index 25b42da..ad5ad5a 100644
--- a/ast/ast.go
+++ b/ast/ast.go
@@ -1,3 +1,5 @@
+// Package ast declares the types used to represent syntax trees for HCL
+// (HashiCorp Configuration Language)
 package ast
 
 import "github.com/fatih/hcl/token"
diff --git a/parser/parser.go b/parser/parser.go
index 9aec5a0..4146077 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -1,3 +1,5 @@
+// Package parser implements a parser for HCL (HashiCorp Configuration
+// Language)
 package parser
 
 import (
diff --git a/printer/printer.go b/printer/printer.go
index 5bedca0..a34d160 100644
--- a/printer/printer.go
+++ b/printer/printer.go
@@ -1,3 +1,4 @@
+// Package printer implements printing of AST nodes to HCL format.
 package printer
 
 import (
diff --git a/token/token.go b/token/token.go
index 7c51f69..3b7581a 100644
--- a/token/token.go
+++ b/token/token.go
@@ -1,3 +1,5 @@
+// Package token defines constants representing the lexical tokens for HCL
+// (HashiCorp Configuration Language)
 package token
 
 import (