Update spec

specification.md

@@ -145,7 +145,9 @@ Comments are discarded by the parser; however, line breaks are taken into accoun
 `long` and `double` are used in the compiler to store mC's `int` and `float` literals, respectively.
 It is assumed that both types are big and precise enough to store the corresponding literal.
 
-Furthermore, it is assumed that arrays and strings are at most `LONG_MAX` elements long.
+String literals are at most 1000 characters long.
+
+Arrays are at most `LONG_MAX` elements long.
 
 ### Special Semantics
 
@@ -162,7 +164,7 @@ An expression used as a condition (for `if` or `while`) is expected to be of typ
 
 Strings are immutable and do not support any operation (e.g. concatenation).
 Like comments, strings can span across multiple lines.
-Whitespaces (i.e. newlines, tabs, spaces) are part of the string.
+Whitespace (i.e. newlines, tabs, spaces) is part of the string.
 Escape sequences are *not* supported.
 
 The sole purpose of strings in mC is to be used with the built-in `print` function (see below).
@@ -547,8 +549,8 @@ The following directory layout is used.
     │   ├── ast.c
     │   ├── ast_print.c
     │   ├── ast_visit.c
-    │   ├── parser.y
-    │   ├── scanner.l
+    │   ├── lexer.c
+    │   ├── parser.c
     │   └── …
     ├── test/
     │   ├── integration/                    # Example inputs for integration testing.