diff --git a/src/Doxyfile.in b/src/Doxyfile.in
index c5ea6585..54897bf3 100644
--- a/src/Doxyfile.in
+++ b/src/Doxyfile.in
@@ -51,7 +51,7 @@ PROJECT_BRIEF          = "@CPACK_PACKAGE_DESCRIPTION_SUMMARY@"
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
-PROJECT_LOGO           =
+PROJECT_LOGO           = @CMAKE_CURRENT_LIST_DIR@/doxygen/mz-automation.ico
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is
diff --git a/src/iec61850/inc/iec61850_client.h b/src/iec61850/inc/iec61850_client.h
index 1c049ff8..4f3496f9 100644
--- a/src/iec61850/inc/iec61850_client.h
+++ b/src/iec61850/inc/iec61850_client.h
@@ -2038,7 +2038,8 @@ ControlObjectClient_getLastError(ControlObjectClient self);
  *
  * \param self the control object instance to use
  * \param ctlVal the control value (for APC the value may be either AnalogueValue (MMS_STRUCT) or MMS_FLOAT/MMS_INTEGER
- * \param operTime the time when the command has to be executed (for time activated control). If this value is 0 the command will be executed instantly.
+ * \param operTime the time when the command has to be executed (for time activated control). The value represents the local time of the
+ *                 server in milliseconds since epoch. If this value is 0 the command will be executed instantly.
  *
  * \return true if operation has been successful, false otherwise.
  */
@@ -2092,7 +2093,8 @@ ControlObjectClient_cancel(ControlObjectClient self);
  * \param self the control object instance to use
  * \param[out] err error code
  * \param ctlVal the control value (for APC the value may be either AnalogueValue (MMS_STRUCT) or MMS_FLOAT/MMS_INTEGER
- * \param operTime the time when the command has to be executed (for time activated control). If this value is 0 the command will be executed instantly.
+ * \param operTime the time when the command has to be executed (for time activated control). The value represents the local time of the
+ *                 server in milliseconds since epoch. If this value is 0 the command will be executed instantly.
  * \param handler the user provided callback handler
  * \param parameter user provided parameter that is passed to the callback handler
  *