Comment out champ directives with a ; => @;Au

README.md

@@ -149,6 +149,14 @@ This will plot FOO against X:
 
 ![FOO against A at PC 0x6015](doc/example03_3.gif?raw=true)
 
+### Disabling watches
+
+To disable a watch, add a `;` right behind the `@`:
+
+```
+        ADC FOO     ; @;Au(post)
+```
+
 ## Did you know?
 
 By the way, there's a full-fledged, incremental, standalone, no-dependencies GIF encoder in [pgif.c](pgif.c) that writes animated GIFs and uses some optimizations to further minimize space. It's stream-friendly and as you feed pixels in via `stdin`, it dutifully writes GIF data to `stdout` until `stdin` gets closed.

champ.rb

@@ -631,7 +631,7 @@ class Champ
                     champ_directives = []
                     if code.include?(';')
                         comment = code[code.index(';') + 1, code.size].strip
-                        comment.scan(/@[^\s]+/).each do |match|
+                        comment.scan(/@[^;][^\s]+/).each do |match|
                             champ_directives << match.to_s
                         end
                     end