diff --git a/include/nativehelper/JNIHelp.h b/include/nativehelper/JNIHelp.h
index 3982797..698cba7 100644
--- a/include/nativehelper/JNIHelp.h
+++ b/include/nativehelper/JNIHelp.h
@@ -53,7 +53,12 @@
 int jniThrowException(C_JNIEnv* env, const char* className, const char* msg);
 
 /*
- * Throw a java.IO.IOException, generating the message from errno.
+ * Throw a java.lang.RuntimeException, with an optional message.
+ */
+int jniThrowRuntimeException(JNIEnv* env, const char* msg);
+
+/*
+ * Throw a java.io.IOException, generating the message from errno.
  */
 int jniThrowIOException(C_JNIEnv* env, int errnum);