1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index a1c6307827f..4e3d65bcd02 100644
--- a/Makefile
+++ b/Makefile
@@ -233,7 +233,7 @@ cscope: cscope.files
 # Build the documentation
 #
 
-DOXY_INPUT = \
+DOXY_INPUT ?= \
 	README.md \
 	vppinfra \
 	svm \