diff --git a/check.py b/check.py
index 12a8eb0..299f6f7 100644
--- a/check.py
+++ b/check.py
@@ -91,7 +91,7 @@ def main():
         },
     ]
 
-    challenges = glob.glob("./*/*")
+    challenges = [path for path in glob.glob("./*/*") if os.path.isdir(path)]
     chal_res = []
 
     for challenge in challenges:
diff --git a/crypto/README.md b/crypto/README.md
new file mode 100644
index 0000000..578435b
--- /dev/null
+++ b/crypto/README.md
@@ -0,0 +1,6 @@
+# An extra README.md
+Lies.
+
+Programmers HATE extra documentation.
+
+But using this ONE WEIRD TRICK...
\ No newline at end of file