diff --git a/include/llvm/System/Program.h b/include/llvm/System/Program.h
index e37ef491e62..45fb9500cdf 100644
--- a/include/llvm/System/Program.h
+++ b/include/llvm/System/Program.h
@@ -22,8 +22,8 @@ namespace sys {
 
   /// This class provides an abstraction for programs that are executable by the
   /// operating system. It provides a platform generic way to find executable
-  /// programs from the path and to execute them. The sys::Path class is used to
-  /// locate the Program.
+  /// programs from the path and to execute them in various ways. The sys::Path
+  /// class is used to specify the location of the Program.
   /// @since 1.4
   /// @brief An abstraction for finding and executing programs.
   class Program {
@@ -43,22 +43,27 @@ namespace sys {
       /// waits for the program to exit. This function will block the current
       /// program until the invoked program exits. The invoked program will 
       /// inherit the stdin, stdout, and stderr file descriptors, the
-      /// environment and other configuration settings of the inoking program.
+      /// environment and other configuration settings of the invoking program.
       /// If Path::executable() does not return true when this function is
       /// called then a std::string is thrown. 
-      /// Path::executable() returns true.
       /// @param path A sys::Path object providing the path of the program to be
       /// executed. It is presumed this is the result of the FindProgramByName
       /// method.
-      /// @param args A vector of strings that are passed to the program.
-      /// The first element should *not* be the name of the program.
       /// @returns an integer result code indicating the status of the program.
-      /// @throws std::string on a variety of error conditions or if the invoked 
+      /// @throws std::string on a variety of error conditions or if the invoked
       /// program aborted abnormally.
       /// @see FindProgrambyName
-      /// @brief Executes the program with the given set of \p arguments.
-      static int ExecuteAndWait(const Path& path, 
-                                const std::vector<std::string>& args);
+      /// @brief Executes the program with the given set of \p args.
+      static int ExecuteAndWait(
+        const Path& path,  ///< The path to the program to execute
+        const std::vector<std::string>& args,
+          ///< A vector of strings that are passed to the program.
+          ///< The first element should *not* be the name of the program.
+        const char ** env = 0
+          ///< An optional vector of strings to use for the program's 
+          ///< environment. If not provided, the current program's environment
+          ///< will be used.
+      );
     /// @}
   };
 }