diff --git a/docs/Doxyfile.qmake b/docs/Doxyfile.qmake
index 14b85087b..32882cf02 100644
--- a/docs/Doxyfile.qmake
+++ b/docs/Doxyfile.qmake
@@ -1122,7 +1122,7 @@ COLS_IN_ALPHA_INDEX    = 5
 # while generating the index headers.
 # This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
 
-IGNORE_PREFIX          =
+IGNORE_PREFIX          = C I T
 
 #---------------------------------------------------------------------------
 # Configuration options related to the HTML output