diff --git a/README.markdown b/README.markdown
index b0a9e43..f4e53ba 100644
--- a/README.markdown
+++ b/README.markdown
@@ -10,3 +10,35 @@
 It also contains a conversion in Javascript, for playing in a web browser,
 in the `impl/swl.js` directory.  This implementation uses modules from
 `yoob.js` to simulate the terminal in an HTML5 canvas.
+
+Changelog-a-go-go
+-----------------
+
+*   v2000.xxxx
+    
+    Initial version, the script written in Perl 5, `swl.pl`.
+    
+*   v2004.0227
+    
+    Version not differing significantly from initial version.
+    
+*   v1.0-2007.1216 a.k.a. v2007.1216
+    
+    Version not differing significantly from initial version.
+    
+*   v1.1-2013.0323
+    
+    Added conversion to Javascript, `swl.js`.
+    
+    Fixed bug in Perl version where you could spray an aerosol can
+    that you didn't actually have.
+    
+    Perl version oddly bore the version number "1.0-2013.0323".
+    
+*   v1.1-2013.0324
+    
+    Fixed bug in Javascript version where you effectively never
+    disembarked from the subway train, once on it.
+    
+    Made clearer from the room description that you are aboard
+    the subway train, when you are.  (Both versions.)