diff --git a/src/lib/error.h++ b/src/lib/error.h++
index a675363..f8fd555 100644
--- a/src/lib/error.h++
+++ b/src/lib/error.h++
@@ -70,4 +70,7 @@ namespace ErrorCodes {
 
     // IndexOutOfRangeException equivalent
     const uint8_t RANGE_ERROR = 1;
+
+    // when going out of bounds in a non-predetermined way
+    const uint8_t OVERRUN_ERROR = 2;
 }