diff --git a/README.md b/README.md
index fef3d5d..dfca2e3 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # Lua
-CMake based build of Lua 5.4.4  
+CMake based build of Lua 5.4.5
 | Build as C | Build as C++ |
 | --: | --: |
 | ![Build Linux](https://github.com/walterschell/Lua/actions/workflows/build-linux.yml/badge.svg?branch=master) | ![Build Linux as C++](https://github.com/walterschell/Lua/actions/workflows/build-linux-cxx.yml/badge.svg?branch=master) |
@@ -13,3 +13,6 @@ add_subdirectory(lua)
 ...
 target_link_libraries(<YOURTARGET> lua_static)
 ```
+
+# Important Note:
+Depending on your use case, Lua v5.4.5 is API and ABI incompatible with v5.4.1-v5.4.4. A second parameter has been added to `lua_resetthread()`. See https://marc.info/?t=168182290600001&r=1&w=2 for more details.
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