diff --git a/CMakeLists.txt b/CMakeLists.txt
index f75a353..88a3306 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,6 +5,26 @@ if(NOT DEFINED PROJECT_VERSION)
     set(PROJECT_VERSION 1.0.0)
 endif()
 
+# Check for and warn if running under Rosetta
+if(APPLE)
+    execute_process(
+        COMMAND sysctl -in sysctl.proc_translated
+        OUTPUT_VARIABLE MACOS_TRANSLATED
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_QUIET
+    )
+
+    if(MACOS_TRANSLATED)
+        message(
+            WARNING
+            "CMake is running under Rosetta. "
+            "This may cause the project to be built for x86_64 instead of arm64. "
+            "Run CMake natively under Apple Silicon or explicitly pass "
+            "-DCMAKE_OSX_ARCHITECTURES=arm64"
+        )
+    endif()
+endif()
+
 project(mcpp VERSION ${PROJECT_VERSION})
 
 set(CMAKE_CXX_STANDARD 17)
diff --git a/README.md b/README.md
index 4f9b11a..af5e47f 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,11 @@ git clone https://github.com/rozukke/mcpp.git && cd mcpp
 cmake -B build && cd build
 sudo make install
 ```
+
+On an M-series Mac, you may encounter: `found architecture 'x86_64', required architecture 'arm64'`.
+This means `cmake` is running under Rosetta. You can fix this by adding `-DCMAKE_OSX_ARCHITECTURES=arm64` after `cmake -B build`.
+But you should fix the root cause by ensuring your `cmake` or `brew` installs are not the intel x86 versions.
+
 - After doing this, the library should be accessible via a `#include <mcpp/mcpp.h>` directive. 
 - When compiling code using the library, use the flag `-lmcpp` for Makefiles or `target_link_libraries(your_executable mcpp)` for CMake.