diff --git a/src/OpenMesh/Core/Mesh/PolyConnectivity_inline_impl.hh b/src/OpenMesh/Core/Mesh/PolyConnectivity_inline_impl.hh
index dd0f3e60..1e45ee74 100644
--- a/src/OpenMesh/Core/Mesh/PolyConnectivity_inline_impl.hh
+++ b/src/OpenMesh/Core/Mesh/PolyConnectivity_inline_impl.hh
@@ -40,7 +40,7 @@
  * ========================================================================= */
 
 #ifndef OPENMESH_POLYCONNECTIVITY_INTERFACE_INCLUDE
-#error Dont include this directly, include instead PolyConnectivity.hh
+#error Do not include this directly, include instead PolyConnectivity.hh
 #endif // OPENMESH_POLYCONNECTIVITY_INTERFACE_INCLUDE
 
 #include <OpenMesh/Core/Mesh/IteratorsT.hh>
diff --git a/src/OpenMesh/Core/Mesh/SmartHandles.hh b/src/OpenMesh/Core/Mesh/SmartHandles.hh
index bce3248d..094a699f 100644
--- a/src/OpenMesh/Core/Mesh/SmartHandles.hh
+++ b/src/OpenMesh/Core/Mesh/SmartHandles.hh
@@ -40,7 +40,7 @@
  * ========================================================================= */
 
 #ifndef OPENMESH_POLYCONNECTIVITY_INTERFACE_INCLUDE
-#error Dont include this directly, include instead PolyConnectivity.hh
+#error Do not include this directly, include instead PolyConnectivity.hh
 #endif//OPENMESH_POLYCONNECTIVITY_INTERFACE_INCLUDE
 
 //== NAMESPACES ===============================================================