Update env var

README.md

@@ -21,7 +21,7 @@ Afterwards, compiling with the feature flag `cairo-native` will enable native ex
 Currently cairo-native with AOT needs a runtime library in a known place. For this you need to compile the [cairo-native-runtime](https://github.com/lambdaclass/cairo_native/tree/main/runtime) crate and point the following environment variable to a folder containing the dynamic library. The path **must** be an absolute path.
 
 ```bash
-CAIRO_NATIVE_RUNTIME_LIBRARY=/absolute/path/to/cairo-native/target/release/
+CAIRO_NATIVE_RUNTIME_LIBRARY=/absolute/path/to/cairo-native/target/release/libcairo_native_runtime.a
 ```
 
 If you don't do this you will get a linker error when using AOT.