Return -1 from CurrentThreadId when called by thread outside the pool.

1 files changed, 1 insertions, 1 deletions

diff --git a/unsupported/Eigen/CXX11/src/ThreadPool/ThreadPoolInterface.h b/unsupported/Eigen/CXX11/src/ThreadPool/ThreadPoolInterface.h
index 569cd4bc8..a65ee97c9 100644
--- a/unsupported/Eigen/CXX11/src/ThreadPool/ThreadPoolInterface.h
+++ b/unsupported/Eigen/CXX11/src/ThreadPool/ThreadPoolInterface.h
@@ -22,7 +22,7 @@ class ThreadPoolInterface {
   virtual int NumThreads() const = 0;
 
   // Returns a logical thread index between 0 and NumThreads() - 1 if called
-  // from one of the threads in the pool. Returns NumThreads() otherwise.
+  // from one of the threads in the pool. Returns -1 otherwise.
   virtual int CurrentThreadId() const = 0;
 
   virtual ~ThreadPoolInterface() {}