diff --git a/src/ypipe.hpp b/src/ypipe.hpp
index c3f2e96d..ffa9ee27 100644
--- a/src/ypipe.hpp
+++ b/src/ypipe.hpp
@@ -95,7 +95,7 @@ namespace zmq
 #pragma message restore
 #endif
 
-        //  Pop an incomplete item from the pipe. Returns true is such
+        //  Pop an incomplete item from the pipe. Returns true if such
         //  item exists, false otherwise.
         inline bool unwrite (T *value_)
         {