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-rw-r--r--readme.markdown2
1 files changed, 1 insertions, 1 deletions
diff --git a/readme.markdown b/readme.markdown
index d96b93e37..0715adfd4 100644
--- a/readme.markdown
+++ b/readme.markdown
@@ -53,7 +53,7 @@ Currently the following OS are supported with tinyusb out of the box with a simp
### Toolchains ###
-You can compile with any of following toolchains
+You can compile with any of following toolchains, however, the stack requires C99 to build with
- lpcxpresso
- Keil MDK