diff --git a/src/main/java/entry/path/PathEntryPoint.java b/src/main/java/entry/path/PathEntryPoint.java
index b715375f..67a5cf45 100644
--- a/src/main/java/entry/path/PathEntryPoint.java
+++ b/src/main/java/entry/path/PathEntryPoint.java
@@ -151,7 +151,16 @@ else if (!field.isEmpty(x, y))
         output("# Enumerate pieces");
         boolean isUsingHold = settings.isUsingHold();
         int piecesDepth = generator.getDepth();
-        output("Piece pop count = " + (isUsingHold && maxDepth < piecesDepth ? maxDepth + 1 : maxDepth));
+        int popCount = isUsingHold && maxDepth < piecesDepth ? maxDepth + 1 : maxDepth;
+        output("Piece pop count = " + popCount);
+        if (popCount < piecesDepth) {
+            output();
+            output("####################################################################");
+            output("WARNING: more pieces is inputted than necessary.");
+            output("         so redundant results may be obtained.");
+            output("####################################################################");
+            output();
+        }
 
         output();