diff --git a/Projects/Rock Paper Scissor Game/README.md b/Projects/Rock Paper Scissor Game/README.md
index 04c5cc4..0d6f59d 100644
--- a/Projects/Rock Paper Scissor Game/README.md	
+++ b/Projects/Rock Paper Scissor Game/README.md	
@@ -18,6 +18,9 @@
 
     while True:
         player = input("Enter your choice ").capitalize()
+        
+        if player not in choices:
+        print(f'invalid input-{player},please enter Rock, Paper, or Scissors')
 
         computer = random.choice(choices)
 
diff --git a/Projects/Rock Paper Scissor Game/rock_paper_scissor_game.py b/Projects/Rock Paper Scissor Game/rock_paper_scissor_game.py
index c349f5d..f4f895c 100644
--- a/Projects/Rock Paper Scissor Game/rock_paper_scissor_game.py	
+++ b/Projects/Rock Paper Scissor Game/rock_paper_scissor_game.py	
@@ -9,6 +9,9 @@
 while True:
     player = input("Enter your choice ").capitalize()
 
+    if player not in choices:
+        print(f'invalid input-{player},please enter Rock, Paper, or Scissors')
+
     computer = random.choice(choices)
 
     if computer == player: