diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -32,6 +32,8 @@
     WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
   )
 
+  SET_TARGET_PROPERTIES(html PROPERTIES PROJECT_LABEL BUILD_DOC)
+
   IF(UNIX)
     INSTALL(
       DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html/