diff --git a/README.md b/README.md
index 372d514e..733171be 100644
--- a/README.md
+++ b/README.md
@@ -267,7 +267,14 @@ Make sure that you specify the architecture you wish to build for in the
 Run:
 
 ```bash
-$ source ./android-configure NDK_PATH gyp
+$ source ./android-configure NDK_PATH gyp [API_LEVEL]
+$ make -C out
+```
+
+The default API level is 24, but a different one can be selected as follows:
+
+```bash
+$ source ./android-configure ~/android-ndk-r15b gyp 21
 $ make -C out
 ```