diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
index e5b333d09494298364bb322101aa79aced4adfea..85538076ec08bfe1ba71b8d5840602b8750cf4ee 100644
--- a/doc/Doxyfile.in
+++ b/doc/Doxyfile.in
@@ -908,7 +908,7 @@ FILE_PATTERNS          = *.c \
 # be searched for input files as well.
 # The default value is: NO.
 
-RECURSIVE              = NO
+RECURSIVE              = YES
 
 # The EXCLUDE tag can be used to specify files and/or directories that should be
 # excluded from the INPUT source files. This way you can easily exclude a