update HOW-TO-BUILD.md (#2969)
Correct Android SDK path.
diff --git a/HOW-TO-BUILD.md b/HOW-TO-BUILD.md
index 2e80002..26e36e9 100644
--- a/HOW-TO-BUILD.md
+++ b/HOW-TO-BUILD.md
@@ -15,7 +15,7 @@
## Android
* JDK `1.8+`
* Android SDK Platform 28
- * `$ANDROID_HOME` must be configured by using `export ANDROID_HOME=/path_to_ndk`
+ * `$ANDROID_HOME` must be configured by using `export ANDROID_HOME=/path_to_sdk`
* Normally, you should install [Android Studio](https://developer.android.com/studio) to get Android SDK Platform 28 installed.
* Gradle 4.10+
* NDK `r18`