diff --git a/GCDTask.h b/GCDTask.h
index 028bb41..6b6ad36 100644
--- a/GCDTask.h
+++ b/GCDTask.h
@@ -26,6 +26,7 @@
 
 @property (strong) NSString* launchPath;
 @property (strong) NSArray* arguments;
+@property (strong) NSDictionary* environment;
 @property BOOL hasExecuted;
 @property __block dispatch_source_t stdoutSource;
 @property __block dispatch_source_t stderrSource;
@@ -35,7 +36,7 @@
 - (void) launchWithOutputBlock: (void (^)(NSData* stdOutData)) stdOut
                 andErrorBlock: (void (^)(NSData* stdErrData)) stdErr
                      onLaunch: (void (^)()) launched
-                       onExit: (void (^)()) exit;
+                       onExit: (void (^)(int)) exit;
 
 - (BOOL) WriteStringToStandardInput: (NSString*) input;
 - (BOOL) WriteDataToStandardInput: (NSData*) input;
diff --git a/GCDTask.m b/GCDTask.m
index 8a8a75d..2749b12 100644
--- a/GCDTask.m
+++ b/GCDTask.m
@@ -18,7 +18,7 @@ - (id) init
 - (void) launchWithOutputBlock: (void (^)(NSData* stdOutData)) stdOut
                  andErrorBlock: (void (^)(NSData* stdErrData)) stdErr
                       onLaunch: (void (^)()) launched
-                        onExit: (void (^)()) exit
+                        onExit: (void (^)(int)) exit
 {
     executingTask = [[NSTask alloc] init];
  
@@ -46,9 +46,12 @@ - (void) launchWithOutputBlock: (void (^)(NSData* stdOutData)) stdOut
         }
     }
     
-    
     [executingTask setArguments:_arguments];
-    
+
+    /* Add Environment variables */
+    if (_environment) {
+        [executingTask setEnvironment:_environment];
+    }
     
     /* Setup pipes */
     stdinPipe = [NSPipe pipe];
@@ -106,7 +109,7 @@ - (void) launchWithOutputBlock: (void (^)(NSData* stdOutData)) stdOut
             dispatch_source_cancel(_stdoutSource);
             dispatch_async(dispatch_get_main_queue(), ^{
                 if(exit)
-                    exit();
+                    exit([executingTask terminationStatus]);
             });
         }
 
@@ -153,7 +156,7 @@ - (void) launchWithOutputBlock: (void (^)(NSData* stdOutData)) stdOut
         dispatch_source_cancel(_stdoutSource);
         dispatch_source_cancel(_stderrSource);
         if(exit)
-            exit();
+            exit([executingTask terminationStatus]);
     };
 
     [executingTask launch];
diff --git a/README.md b/README.md
index 3ce60c5..0bbb054 100644
--- a/README.md
+++ b/README.md
@@ -21,8 +21,8 @@ Example usage:
         NSLog(@"ERR: %@", output);
     } onLaunch:^{
         NSLog(@"Task has started running.");
-    } onExit:^{
-        NSLog(@"Task has now quit.");
+    } onExit:^(int exitStatus) {
+        NSLog(@"Task has now quit. Exit status %d",exitStatus);
     }];
 
 ```