diff --git a/exl/linking.fzs b/exl/linking.fzs
new file mode 100644
index 0000000..a2e2396
--- /dev/null
+++ b/exl/linking.fzs
@@ -0,0 +1,38 @@
+extern "libglfw" {
+  type GLFWwindow  = handle;
+  type GLFWmonitor = handle;
+
+  struct GLFWvidmode {
+    int width;
+    int height;
+    int redBits;
+    int greenBits;
+    int blueBits;
+    int refreshRate;
+  }
+
+  /// GLFWvidmode*
+  type GLFWvidmodeRef = ref GLFWvidmode;
+
+  /// Create window with specified [width], [height] and [title]
+  fn glfw_mkWindow(
+    int width,
+    int height,
+    str title,
+    GLFWmonitor mon,
+    GLFWwindow shr
+  ) GLFWwindow = "glfwCreateWindow";
+
+  /// Get videomode from monitor [mon]
+  fn glfw_getVideoMode(
+    GLFWmonitor mon
+  ) GLFWvidmodeRef = "glfwGetVideoMode";
+
+  /// Get framebuffer [width] and [height]
+  fn glfw_getFrameBufferSize(
+    GLFWwindow win,
+    out int width,
+    out int height
+  ) = "glfwGetFramebufferSize";
+}
+
diff --git a/include/compiler/fzl_token.h b/include/compiler/fzl_token.h
index 21ac815..2a5cee3 100644
--- a/include/compiler/fzl_token.h
+++ b/include/compiler/fzl_token.h
@@ -8,32 +8,40 @@
 // Token type
 typedef enum
 {
-  FZL_TOKTYPE_CLASS, // class
-  FZL_TOKTYPE_NEW,   // new
+  FZL_TOKTYPE_IMPORT,    // `import`
+  FZL_TOKTYPE_EXTERN,    // `extern`
+  FZL_TOKTYPE_TYPEDEF,   // `type`
+  FZL_TOKTYPE_HANDLE,    // `handle`
+  FZL_TOKTYPE_STRUCT,    // `struct`
+  FZL_TOKTYPE_REFERENCE, // `ref`
+  FZL_TOKTYPE_OUT,       // `out`
 
-  FZL_TOKTYPE_FUNCTION, // fn
-  FZL_TOKTYPE_RETURN,   // return
+  FZL_TOKTYPE_CLASS, // `class`
+  FZL_TOKTYPE_NEW,   // `new`
 
-  FZL_TOKTYPE_FOR,   // for
-  FZL_TOKTYPE_WHILE, // while
-  FZL_TOKTYPE_BREAK, // break
+  FZL_TOKTYPE_FUNCTION, // `fn`
+  FZL_TOKTYPE_RETURN,   // `return`
 
-  FZL_TOKTYPE_IF,   // if
-  FZL_TOKTYPE_ELSE, // else
+  FZL_TOKTYPE_FOR,   // `for`
+  FZL_TOKTYPE_WHILE, // `while`
+  FZL_TOKTYPE_BREAK, // `break`
+
+  FZL_TOKTYPE_IF,   // `if`
+  FZL_TOKTYPE_ELSE, // `else`
 
   FZL_TOKTYPE_NAME, // abc
   FZL_TOKTYPE_TYPE, // i16
 
-  FZL_TOKTYPE_DDASH, // // :D
+  FZL_TOKTYPE_DDASH, // `//` :D
 
-  FZL_TOKTYPE_LPAREN, // (
-  FZL_TOKTYPE_RPAREN, // )
-  FZL_TOKTYPE_LBRACE, // {
-  FZL_TOKTYPE_RBRACE, // }
+  FZL_TOKTYPE_LPAREN, // `(`
+  FZL_TOKTYPE_RPAREN, // `)`
+  FZL_TOKTYPE_LBRACE, // `{`
+  FZL_TOKTYPE_RBRACE, // `}`
 
-  FZL_TOKTYPE_COMMA,     // ,
-  FZL_TOKTYPE_DOT,       // .
-  FZL_TOKTYPE_SEMICOLON, // ;
+  FZL_TOKTYPE_COMMA,     // `,`
+  FZL_TOKTYPE_DOT,       // `.`
+  FZL_TOKTYPE_SEMICOLON, // `;`
 
   FZL_TOKTYPE_STR_LITERAL,  // ""
   FZL_TOKTYPE_NUM_LITERAL,  // 123
@@ -43,25 +51,25 @@ typedef enum
   FZL_TOKTYPE_STR_FORMAT_START, // `$` before `"`
   FZL_TOKTYPE_STR_FORMAT_END,   // end of string formatting sequence
 
-  FZL_TOKTYPE_DAMPERSAND, // &&
-  FZL_TOKTYPE_DVBAR,      // ||
+  FZL_TOKTYPE_DAMPERSAND, // `&&`
+  FZL_TOKTYPE_DVBAR,      // `||`
 
-  FZL_TOKTYPE_EQEQ,   // ==
-  FZL_TOKTYPE_REQ,    // >=
-  FZL_TOKTYPE_LEQ,    // <=
-  FZL_TOKTYPE_NEQ,    // !=
-  FZL_TOKTYPE_LANGLE, // <
-  FZL_TOKTYPE_RANGLE, // >
-  FZL_TOKTYPE_NOT,    // !
+  FZL_TOKTYPE_EQEQ,   // `==`
+  FZL_TOKTYPE_REQ,    // `>=`
+  FZL_TOKTYPE_LEQ,    // `<=`
+  FZL_TOKTYPE_NEQ,    // `!=`
+  FZL_TOKTYPE_LANGLE, // `<`
+  FZL_TOKTYPE_RANGLE, // `>`
+  FZL_TOKTYPE_NOT,    // `!`
 
-  FZL_TOKTYPE_STAR,    // *
-  FZL_TOKTYPE_SLASH,   // /
-  FZL_TOKTYPE_PLUS,    // +
-  FZL_TOKTYPE_MINUS,   // -
-  FZL_TOKTYPE_CARET,   // ^
-  FZL_TOKTYPE_PERCENT, // %
+  FZL_TOKTYPE_STAR,    // `*`
+  FZL_TOKTYPE_SLASH,   // `/`
+  FZL_TOKTYPE_PLUS,    // `+`
+  FZL_TOKTYPE_MINUS,   // `-`
+  FZL_TOKTYPE_CARET,   // `^`
+  FZL_TOKTYPE_PERCENT, // `%`
 
-  FZL_TOKTYPE_EQ // =
+  FZL_TOKTYPE_EQ // `=`
 } fzl_toktype_t;
 
 // Token descriptor