diff --git a/doc/jvm/index.md b/doc/jvm/index.md
index 13c2aa709..88879c2d8 100644
--- a/doc/jvm/index.md
+++ b/doc/jvm/index.md
@@ -7,7 +7,7 @@ You have find XGBoost JVM Package!
 
 Installation
 ------------
-Currently, XGBoost4J only support installation from source. Building XGBoost4J using Maven requires Maven 3 or newer and Java 7+.
+Currently, XGBoost4J only support installation from source. Building XGBoost4J using Maven requires Maven 3 or newer, Java 7+ and CMake 3.2+ for compiling the JNI bindings.
 
 Before you install XGBoost4J, you need to define environment variable `JAVA_HOME` as your JDK directory to ensure that your compiler can find `jni.h` correctly, since XGBoost4J relies on JNI to implement the interaction between the JVM and native libraries.