diff --git a/src/Lexer.h b/src/Lexer.h
index 2323b95..37afd1f 100644
--- a/src/Lexer.h
+++ b/src/Lexer.h
@@ -5,7 +5,9 @@
 #include <string>
 #include <array>
 
+/* Let's redefine TokenStream, as if it wasn't already defined in Token.h*/
 typedef std::vector<Token> TokenStream;
+/* The number of data types currently in Sapphire. */
 #define TYPE_COUNT 14
 
 class Lexer
@@ -34,12 +36,17 @@ private:
 
     bool is_in_string(const std::string& string, const char& character);
 public:
+    /* An array containing Sapphire's current data types. */
     static const std::array<std::string,TYPE_COUNT> types;
+    
     ~Lexer();
 
+    /* Lex the given text, turning it into a stream of tokens. */
     TokenStream lex(const std::string& text);
 
+    /* Create a new Lexer and return a pointer to it. */
     static std::shared_ptr<Lexer> make_lexer(const std::string& fname);
 
+    /* If the Lexer is lexing an impòrted file, give it the location in the parent file at which it was imported. */
     static void assign_parent_location(std::shared_ptr<Lexer>& lexer, const std::shared_ptr<Location>& loc);
 };