diff --git a/configure.ac b/configure.ac
index f3f87da3..f95d8467 100644
--- a/configure.ac
+++ b/configure.ac
@@ -104,6 +104,7 @@ AC_CHECK_FUNCS([isnan],    , AC_CHECK_LIB(m, isnan))
 
 AC_CONFIG_FILES([
   Makefile
+  doc/Makefile
   examples/Makefile
   src/Makefile
   tests/Makefile