diff --git a/mlir/include/mlir/IR/Region.h b/mlir/include/mlir/IR/Region.h
--- a/mlir/include/mlir/IR/Region.h
+++ b/mlir/include/mlir/IR/Region.h
@@ -296,7 +296,7 @@
 
   /// Displays the CFG in a window. This is for use from the debugger and
   /// depends on Graphviz to generate the graph.
-  /// This function is defined in ViewRegionGraph and only works with that
+  /// This function is defined in ViewOpGraph.cpp and only works with that
   /// target linked.
   void viewGraph(const Twine &regionName);
   void viewGraph();