diff --git a/Source/cmUnixMakefileGenerator.cxx b/Source/cmUnixMakefileGenerator.cxx
index 56c0aaf1a..7ae25d5be 100644
--- a/Source/cmUnixMakefileGenerator.cxx
+++ b/Source/cmUnixMakefileGenerator.cxx
@@ -266,6 +266,7 @@ void cmUnixMakefileGenerator::OutputMakefile(const char* file)
        cmSystemTools::Error("Error can not open for write: ", dependName.c_str());
        return;
       }
+    dependout << "# .o dependencies in this directory." << std::endl;
     this->OutputObjectDepends(dependout);
     }
   this->OutputCustomRules(fout);