diff --git a/README.md b/README.md
index 4935a0e..5e05f34 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ See also
 # Requirements
 
 - MKL-DNN Library (0.14 or later)
-- ProtocolBuffers (3.5.1 is checked)
+- Protocol Buffers (3.5.1 is checked)
 
 # Build