diff --git a/Makefile b/Makefile
index 89b238b..cd15f23 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,9 @@ format:
 	clang-format --verbose -i \
 		examples/*.cpp \
 		include/*.hpp \
+		include/experimental/*.hpp \
 		src/*.cpp \
+		src/experimental/*.cpp \
 		tests/*.cpp
 
 clean: