diff --git a/c/README.md b/c/README.md
index eacdc54..e3fca0c 100644
--- a/c/README.md
+++ b/c/README.md
@@ -250,7 +250,7 @@ gcc -shared -O3 -o libblake3.so -DBLAKE3_NO_SSE2 -DBLAKE3_NO_SSE41 -DBLAKE3_NO_A
 
 ## ARM NEON
 
-The NEON implementation is enabled by default on AARCH64, but not on
+The NEON implementation is enabled by default on AArch64, but not on
 other ARM targets, since not all of them support it. To enable it, set
 `BLAKE3_USE_NEON=1`. Here's an example of building a shared library on
 ARM Linux with NEON support:
@@ -260,7 +260,7 @@ gcc -shared -O3 -o libblake3.so -DBLAKE3_USE_NEON=1 blake3.c blake3_dispatch.c \
     blake3_portable.c blake3_neon.c
 ```
 
-To explicitiy disable using NEON instructions on AARCH64, set
+To explicitiy disable using NEON instructions on AArch64, set
 `BLAKE3_USE_NEON=0`.
 
 ```bash