diff --git a/Documentation/Doxyfile.in b/Documentation/Doxyfile.in
index 1ef560f624e48b53840e796bf524a89b2b81680f..a3f5e1673f488dd786a052c18a7d289439dcb0e8 100644
--- a/Documentation/Doxyfile.in
+++ b/Documentation/Doxyfile.in
@@ -2023,7 +2023,7 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             =
+PREDEFINED             = DOXYGEN_DOCU_ONLY
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The