diff --git a/doc/gpu_object_detection.tex b/doc/gpu_object_detection.tex
index c6b8a7a57..b414507f6 100644
--- a/doc/gpu_object_detection.tex
+++ b/doc/gpu_object_detection.tex
@@ -1,7 +1,7 @@
 \section{Object Detection}
 
 \cvclass{gpu::HOGDescriptor}
-Histogram of Oriented Gradients descriptor and detector.
+\href{http://www.acemedia.org/aceMedia/files/document/wp7/2005/cvpr05-inria.pdf}{Histogram of Oriented Gradients} descriptor and detector.
 
 \begin{lstlisting}
 struct CV_EXPORTS HOGDescriptor