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diff --git a/README.txt b/README.txt
index 2158741..6f9004e 100644
--- a/README.txt
+++ b/README.txt
@@ -638,9 +638,10 @@ would have the same effect.
 
 Non-standard parameters
 -----------------------
-The AppEnvironment and AppEnvironmentExtra parameters recognise an
-additional argument when querying the environment.  The following syntax
-will print all extra environment variables configured for a service
+The AppEnvironment, AppEnvironmentExtra and Environment parameters
+recognise an additional argument when querying the environment.  The
+following syntax will print all extra environment variables configured
+for a service
 
     nssm get <servicename> AppEnvironmentExtra
 
@@ -655,6 +656,39 @@ KEY=VALUE pair in separate command line arguments.  For example:
 
     nssm set <servicename> AppEnvironment CLASSPATH=C:\Classes TEMP=C:\Temp
 
+Alternatively the KEY can be prefixed with a + or - symbol to respectively
+add or remove a pair from the block.
+
+The following two lines set CLASSPATH and TEMP:
+
+    nssm set <servicename> AppEnvironment CLASSPATH=C:\Classes
+    nssm set <servicename> AppEnvironment +TEMP=C:\Temp
+
+If the key is already present, specifying +KEY will override the value
+while preserving the order of keys:
+
+    nssm set <servicename> AppEnvironment +CLASSPATH=C:\NewClasses
+
+The following syntax removes a single variable from the block while
+leaving any other variables in place.
+
+    nssm set <servicename> AppEnvironment -TEMP
+
+Specifying -KEY=VALUE will remove the variable only if the existing
+value matches.
+
+The following syntax would not remove TEMP=C:\Temp
+
+    nssm set <servicename> AppEnvironment -TEMP=C:\Work\Temporary
+
+The + and - symbols are valid characters in environment variables.
+The syntax :KEY=VALUE is equivalent to KEY=VALUE and can be used to
+set variables which start with +/- or to explicitly reset the block in
+a script:
+
+    nssm set <servicename> AppEnvironment :CLASSPATH=C:\Classes
+    nssm set <servicename> AppEnvironment +TEMP=C:\Temp
+
 
 The AppExit parameter requires an additional argument specifying the exit
 code to get or set.  The default action can be specified with the string
@@ -695,6 +729,34 @@ separate command line arguments.  For example:
 
     nssm set <servicename> DependOnService RpcSs LanmanWorkstation
 
+Alternatively the dependency name can be prefixed with a + or - symbol to
+respectively add or remove a dependency.
+
+The following two lines set dependencies on RpcSs and LanmanWorkstation:
+
+    nssm set <servicename> DependOnService RpcSs
+    nssm set <servicename> DependOnService +LanmanWorkstation
+
+The follwing syntax removes the dependency on RpcSs:
+
+    nssm set <servicename> DependOnService -RpcSs
+
+Service groups should, strictly speaking, be prefixed with the + symbol.
+To specify a single dependency on a group, the + symbol can be prefixed
+with the : symbol.
+
+The following lines are equivalent, and each set a dependency ONLY on
+NetBIOSGroup:
+
+    nssm set <servicename> DependOnGroup NetBIOSGroup
+    nssm set <servicename> DependOnGroup :NetBIOSGroup
+    nssm set <servicename> DependOnGroup :+NetBIOSGroup
+
+Whereas these lines add to any existing dependencies:
+
+    nssm set <servicename> DependOnGroup +NetBIOSGroup
+    nssm set <servicename> DependOnGroup ++NetBIOSGroup
+
 
 The Name parameter can only be queried, not set.  It returns the service's
 registry key name.  This may be useful to know if you take advantage of