1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index 9c40b79e..6d172cfd 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@ oasis is a small linux system
 To build it, you need a POSIX system with following tools:
 
 * C toolchain for both host and target system
+	- target toolchain must support [`#include_next`](https://gcc.gnu.org/onlinedocs/cpp/Wrapper-Headers.html)
 * git
 * gzip
 * ninja