diff --git a/HISTORY.markdown b/HISTORY.markdown
index b0c0a31..7539862 100644
--- a/HISTORY.markdown
+++ b/HISTORY.markdown
@@ -1,6 +1,11 @@
 History of SixtyPical
 =====================
 
+0.6-PRE
+-------
+
+*   Added `routine` and `vector` types, and `copy` instruction.
+
 0.5
 ---
 
diff --git a/README.markdown b/README.markdown
index 667beb2..93e15b5 100644
--- a/README.markdown
+++ b/README.markdown
@@ -34,15 +34,16 @@ TODO
 For 0.6:
 
 *   `interrupt` routines.
-*   `vector` type.
-*   `with sei` blocks.
-*   `copy` instruction.
+*   `goto` (tail call).
+*   `vector` type... with declared `inputs` `outputs` `trashes`?
+*   `copy` instruction... that can copy a constant to a user-def mem loc.
 *   A more involved demo for the C64 — one that sets up an interrupt.
 
 For 0.7:
 
 *   `word` type.
 *   `trash` instruction.
+*   zero-page memory locations.
 *   indirect addressing.
 
 At some point...
diff --git a/src/sixtypical/parser.py b/src/sixtypical/parser.py
index 90c28e6..8b41679 100644
--- a/src/sixtypical/parser.py
+++ b/src/sixtypical/parser.py
@@ -248,7 +248,10 @@ class Parser(object):
             self.scanner.scan()
             name = self.scanner.token
             self.scanner.scan()
-            # TODO: check that is has been defined
+            if name not in self.symbols:
+                raise SyntaxError('Undefined routine "%s"' % name)
+            if self.symbols[name].model.type != TYPE_ROUTINE:
+                raise SyntaxError('Illegal call of non-routine "%s"' % name)
             return Instr(opcode=opcode, name=name, dest=None, src=None)
         elif self.scanner.token in ("copy",):
             opcode = self.scanner.token
diff --git a/tests/SixtyPical Syntax.md b/tests/SixtyPical Syntax.md
index 7fb614d..e5d36a5 100644
--- a/tests/SixtyPical Syntax.md	
+++ b/tests/SixtyPical Syntax.md	
@@ -163,15 +163,33 @@ Can't shadow the name of a register or a flag.
     | }
     ? SyntaxError
 
-> Can't call routine that hasn;t been defined.
-> 
->     | routine main {
->     |     ld x, 0
->     |     ld y, 1
->     |     call up
->     |     call up
->     | }
->     ? SyntaxError
+Can't call routine that hasn't been defined.
+
+    | routine main {
+    |     ld x, 0
+    |     ld y, 1
+    |     call up
+    |     call up
+    | }
+    ? SyntaxError
+
+And you can't call a non-routine.
+
+    | byte up
+    | 
+    | routine main {
+    |     ld x, 0
+    |     ld y, 1
+    |     call up
+    | }
+    ? SyntaxError
+
+    | routine main {
+    |     ld x, 0
+    |     ld y, 1
+    |     call x
+    | }
+    ? SyntaxError
 
 Can't define two routines with the same name.