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diff --git a/README.txt b/README.txt
index f2fe712..f218e83 100644
--- a/README.txt
+++ b/README.txt
@@ -1,5 +1,5 @@
 NSSM: The Non-Sucking Service Manager
-Version 2.17, 2013-11-12
+Version 2.19, 2013-11-22
 
 NSSM is a service helper program similar to srvany and cygrunsrv.  It can 
 start any application as an NT service and will restart the service if it 
@@ -46,6 +46,13 @@ to an arbitrary path.
 Since version 2.18, NSSM can be configured to wait a user-specified amount
 of time for the application to exit when shutting down.
 
+Since version 2.19, many more service options can be configured with the
+GUI installer as well as via the registry.
+
+Since version 2.19, NSSM can add to the service's environment by setting
+AppEnvironmentExtra in place of or in addition to the srvany-compatible
+AppEnvironment.
+
 
 Usage
 -----
@@ -227,6 +234,22 @@ work.  Remember, however, that the path must be accessible to the user
 running the service.
 
 
+Environment variables
+---------------------
+NSSM can replace or append to the managed application's environment.  Two
+multi-valued string (REG_MULTI_SZ) registry values are recognised under
+HKLM\SYSTEM\CurrentControlSet\Services\<service>\Parameters.
+
+AppEnvironment defines a list of environment variables which will override
+the service's environment.  AppEnvironmentExtra defines a list of
+environment variables which will be added to the service's environment.
+
+Each entry in the list should be of the form KEY=VALUE.  It is possible to
+omit the VALUE but the = symbol is mandatory.
+
+srvany only supports AppEnvironment.
+
+
 Removing services using the GUI
 -------------------------------
 NSSM can also remove services.  Run
@@ -300,6 +323,7 @@ Thanks to Eric Cheldelin for the inspiration to generate a Control-C event
 on shutdown.
 Thanks to Brian Baxter for suggesting how to escape quotes from the command prompt.
 Thanks to Russ Holmann for suggesting that the shutdown timeout be configurable.
+Thanks to Paul Spause for spotting a bug with default registry entries.
 
 Licence
 -------