diff --git a/builder/builder.go b/builder/builder.go
index 6d98ff4..9744d64 100644
--- a/builder/builder.go
+++ b/builder/builder.go
@@ -13,6 +13,9 @@ import (
 // Builder defines a generic methods available for Select, Insert, Update and Delete builders.
 type Builder interface {
 	// String returns the underlying query as a raw statement.
+	// This function should be used for debugging since it doesn't escape anything and is completely
+	// vulnerable to SQL injection.
+	// You should use either NamedQuery() or Query()...
 	String() string
 	// NamedQuery returns the underlying query as a named statement.
 	NamedQuery() (string, map[string]interface{})
diff --git a/builder/delete.go b/builder/delete.go
index 80f144b..f404b58 100644
--- a/builder/delete.go
+++ b/builder/delete.go
@@ -82,6 +82,9 @@ func (b Delete) Returning(values ...interface{}) Delete {
 }
 
 // String returns the underlying query as a raw statement.
+// This function should be used for debugging since it doesn't escape anything and is completely
+// vulnerable to SQL injection.
+// You should use either NamedQuery() or Query()...
 func (b Delete) String() string {
 	var ctx types.RawContext
 	b.query.Write(&ctx)
diff --git a/builder/doc.go b/builder/doc.go
new file mode 100644
index 0000000..ade8cfe
--- /dev/null
+++ b/builder/doc.go
@@ -0,0 +1,8 @@
+// Package builder receives user input and generates an AST using "stmt" package.
+//
+// There is four builder to manipulate an AST: Select, Insert, Update and Delete.
+//
+// When the AST is ready, you can use String(), NamedQuery() or Query() to generate the underlying query.
+// However, be vigilant with String(): it's mainly used for debugging because it's completely vulnerable
+// to SQL injection...
+package builder
diff --git a/builder/insert.go b/builder/insert.go
index 206c233..0121f2c 100644
--- a/builder/insert.go
+++ b/builder/insert.go
@@ -134,6 +134,9 @@ func (b Insert) Set(args ...interface{}) Insert {
 }
 
 // String returns the underlying query as a raw statement.
+// This function should be used for debugging since it doesn't escape anything and is completely
+// vulnerable to SQL injection.
+// You should use either NamedQuery() or Query()...
 func (b Insert) String() string {
 	var ctx types.RawContext
 	b.insert.Write(&ctx)
diff --git a/builder/select.go b/builder/select.go
index 6c8d6b7..509a0c8 100644
--- a/builder/select.go
+++ b/builder/select.go
@@ -225,6 +225,9 @@ func (b Select) Prefix(prefix interface{}) Select {
 }
 
 // String returns the underlying query as a raw statement.
+// This function should be used for debugging since it doesn't escape anything and is completely
+// vulnerable to SQL injection.
+// You should use either NamedQuery() or Query()...
 func (b Select) String() string {
 	var ctx types.RawContext
 	b.query.Write(&ctx)
diff --git a/builder/update.go b/builder/update.go
index d4d046e..46878c8 100644
--- a/builder/update.go
+++ b/builder/update.go
@@ -96,6 +96,9 @@ func (b Update) Returning(values ...interface{}) Update {
 }
 
 // String returns the underlying query as a raw statement.
+// This function should be used for debugging since it doesn't escape anything and is completely
+// vulnerable to SQL injection.
+// You should use either NamedQuery() or Query()...
 func (b Update) String() string {
 	var ctx types.RawContext
 	b.query.Write(&ctx)
diff --git a/doc.go b/doc.go
new file mode 100644
index 0000000..b299b4a
--- /dev/null
+++ b/doc.go
@@ -0,0 +1,66 @@
+// Package loukoum provides a simple SQL Query Builder.
+// At the moment, only PostgreSQL is supported.
+//
+// If you have to generate complex queries, which rely on various contexts, loukoum is the right tool for you.
+// It helps you generate SQL queries from composable parts.
+// However, keep in mind it's not an ORM or a Mapper so you have to use a SQL connector
+// (like "database/sql" or "sqlx", for example) to execute queries.
+//
+// If you're afraid to slip a tiny SQL injection manipulating fmt (or a byte buffer...) when you append
+// conditions, loukoum is here to protect you against yourself.
+//
+// For further informations, you can read this documentation:
+// https://github.com/ulule/loukoum/blob/master/README.md
+//
+// Or you can discover loukoum with these examples.
+// An "insert" can be generated like that:
+//
+//   builder := loukoum.Insert("comments").
+//       Set(
+//           loukoum.Pair("email", comment.Email),
+//           loukoum.Pair("status", "waiting"),
+//           loukoum.Pair("message", comment.Message),
+//           loukoum.Pair("created_at", loukoum.Raw("NOW()")),
+//       ).
+//       Returning("id")
+//
+// Also, if you need an upsert, you can define a "on conflict" clause:
+//
+//   builder := loukoum.Insert("comments").
+//       Set(
+//           loukoum.Pair("email", comment.Email),
+//           loukoum.Pair("status", "waiting"),
+//           loukoum.Pair("message", comment.Message),
+//           loukoum.Pair("created_at", loukoum.Raw("NOW()")),
+//       ).
+//       OnConflict("email", loukoum.DoUpdate(
+//           loukoum.Pair("message", comment.Message),
+//           loukoum.Pair("status", "waiting"),
+//           loukoum.Pair("created_at", loukoum.Raw("NOW()")),
+//           loukoum.Pair("deleted_at", nil),
+//       )).
+//       Returning("id")
+//
+// Updating a news is also simple:
+//
+//   builder := loukoum.Update("news").
+//       Set(
+//           loukoum.Pair("published_at", loukoum.Raw("NOW()")),
+//           loukoum.Pair("status", "published"),
+//       ).
+//       Where(loukoum.Condition("id").Equal(news.ID)).
+//       And(loukoum.Condition("deleted_at").IsNull(true)).
+//       Returning("published_at")
+//
+// You can remove a specific user:
+//
+//   builder := loukoum.Delete("users").
+//       Where(loukoum.Condition("id").Equal(user.ID))
+//
+// Or select a list of users...
+//
+//   builder := loukoum.Select("id", "first_name", "last_name", "email").
+//       From("users").
+//       Where(loukoum.Condition("deleted_at").IsNull(true))
+//
+package loukoum
diff --git a/format/doc.go b/format/doc.go
new file mode 100644
index 0000000..8c02eaf
--- /dev/null
+++ b/format/doc.go
@@ -0,0 +1,2 @@
+// Package format escape various types for types.RawContext.
+package format
diff --git a/format/format.go b/format/format.go
index 23102e8..a6c2040 100644
--- a/format/format.go
+++ b/format/format.go
@@ -49,7 +49,7 @@ func Value(arg interface{}) string { // nolint: gocyclo
 }
 
 // String formats the given string.
-func String(value string) string { // nolint: errcheck
+func String(value string) string {
 	buffer := &bytes.Buffer{}
 	writeRune(buffer, '\'')
 	for _, char := range value {
diff --git a/stmt/doc.go b/stmt/doc.go
new file mode 100644
index 0000000..663a538
--- /dev/null
+++ b/stmt/doc.go
@@ -0,0 +1,4 @@
+// Package stmt defines various statements and clauses that are used to generate queries.
+//
+// Unless you have to develop complex queries, you should'nt have to use this package.
+package stmt
diff --git a/types/doc.go b/types/doc.go
new file mode 100644
index 0000000..56a4f0c
--- /dev/null
+++ b/types/doc.go
@@ -0,0 +1,4 @@
+// Package types defines some internal types that are handled by the "builder" and "stmt" package.
+//
+// RawContext, StdContext and NamedContext are used to generate queries.
+package types