diff --git a/doc/memory_usage.md b/doc/memory_usage.md
index b72be5e0..ec0624c6 100644
--- a/doc/memory_usage.md
+++ b/doc/memory_usage.md
@@ -14,8 +14,7 @@ the following configuration is assumed in this document:
 * libc heap is used
 * app heap is not used
 * The pthread implementation in `wasi-libc`, which is based on `wasi-threads`
-  (`WASM_ENABLE_LIB_WASI_THREADS`, which is not available on `main` branch
-  yet) might be used
+  (`WASM_ENABLE_LIB_WASI_THREADS`) might be used
 * The another pthread implementation (`WASM_ENABLE_LIB_PTHREAD`) is not used
 
 Module