diff --git a/sdk/librishka/io.h b/sdk/librishka/io.h
index 884e503..d54c6ac 100644
--- a/sdk/librishka/io.h
+++ b/sdk/librishka/io.h
@@ -26,6 +26,7 @@ class IO {
     static void printn(i64 number);
     static void printd(double number);
     static rune readch();
+    static string readline();
 };
 
 #endif
\ No newline at end of file