diff --git a/README.md b/README.md
index 1660716b..1fdb1448 100644
--- a/README.md
+++ b/README.md
@@ -149,4 +149,6 @@ You can download `artifact.zip` from [Github Release](https://github.com/bluelov
 
 ## License
 
-MIT License
+PocketPy is licensed under the [MIT License](http://opensource.org/licenses/MIT).
+
+PocketPy uses [emhash](https://github.com/ktprime/emhash)(MIT License) to implement Python's internal `__dict__` object. [emhash](https://github.com/ktprime/emhash) is 40% faster than `std::unordered_map`.
diff --git a/src/hash_table8.hpp b/src/hash_table8.hpp
index eb609cf0..447de02a 100644
--- a/src/hash_table8.hpp
+++ b/src/hash_table8.hpp
@@ -1660,7 +1660,7 @@ one-way search strategy.
 
 #if EMH_WYHASH_HASH
     //#define WYHASH_CONDOM 1
-    inline uint64_t wymix(uint64_t A, uint64_t B)
+    inline static uint64_t wymix(uint64_t A, uint64_t B)
     {
 #if defined(__SIZEOF_INT128__)
         __uint128_t r = A; r *= B;