diff --git a/doc/doxyfile.in b/doc/doxyfile.in
index dda9f00..0287731 100644
--- a/doc/doxyfile.in
+++ b/doc/doxyfile.in
@@ -640,7 +640,7 @@ FILE_PATTERNS          = *.[ch]xx \
 # should be searched for input files as well. Possible values are YES and NO.
 # If left blank NO is used.
 
-RECURSIVE              = NO
+RECURSIVE              = YES
 
 # The EXCLUDE tag can be used to specify files and/or directories that should
 # excluded from the INPUT source files. This way you can easily exclude a