diff --git a/BackupRotator.py b/BackupRotator.py
index ea3265a..c245b7c 100755
--- a/BackupRotator.py
+++ b/BackupRotator.py
@@ -24,12 +24,19 @@ import yaml
 
 class BackupRotator:
 	
+	__DEFAULT_VALID_EXTENSIONS = [
+		"yaml",
+		"yml"
+	]
+	
 	def __init__(self):
 		
 		self.__dry_run = False
 		self.__configs = []
 		self.__config_paths = []
 		self.__calculated_actions = []
+
+		self.__valid_extensions = self.__DEFAULT_VALID_EXTENSIONS
 	
 	def run(self, configs, dry_run: bool = False):
 		
@@ -77,8 +84,9 @@ class BackupRotator:
 		# Use each config path
 		for path in paths:
 			
-			# If this is a single path
+			# If this is a single file
 			if os.path.isfile(path):
+				
 				self._consume_config(path)
 			
 			# If this is a directory
@@ -86,7 +94,11 @@ class BackupRotator:
 				
 				# Iterate over each file inside
 				for file_name in os.listdir(path):
-					self._consume_config(os.path.join(path, file_name))
+					
+					one_file = os.path.join(path, file_name)
+					
+					if os.path.isfile(one_file) and self._check_file_extension(file_path=one_file, extensions=None):
+						self._consume_config(one_file)
 				
 	def _consume_config(self, path: str):
 		
@@ -386,3 +398,20 @@ class BackupRotator:
 			self.log("No value found for \"minimum-items\"; Will not enforce minimum item constraint.")
 		
 		return minimum_items
+
+	def _check_file_extension(self, file_path, extensions: list=None):
+		
+		if extensions is None:
+			extensions = self.__valid_extensions
+		
+		file_name, file_extension = os.path.splitext(file_path)
+		if len(file_extension) > 0 and file_extension[0] == ".":
+			file_extension = file_extension[1:]
+		file_extension = file_extension.lower()
+
+		for valid_extension in extensions:
+			#print(file_name, "---", file_extension, "---", valid_extension)
+			if file_extension == valid_extension:
+				return True
+		
+		return False