diff --git a/simple_utils.py b/simple_utils.py
index 3526e94..ae6cbd9 100644
--- a/simple_utils.py
+++ b/simple_utils.py
@@ -1,11 +1,37 @@
 # simple_utils.py - A tiny utility library
 
 def reverse_string(text):
-    """Reverses the characters in a string."""
+    """
+    Reverses the characters in a string.
+    
+    Args:
+        text: The string to reverse.
+    
+    Returns:
+        A new string with the characters of text in reverse order.
+    """
     return text[::-1]
 
 def count_words(sentence):
+    """
+    Counts the number of words in a sentence.
+    
+    Args:
+        sentence: The input string to analyze.
+    
+    Returns:
+        The number of words separated by whitespace in the sentence.
+    """
     return len(sentence.split())
 
 def celsius_to_fahrenheit(celsius):
+    """
+    Converts a temperature from Celsius to Fahrenheit.
+    
+    Args:
+        celsius: Temperature value in degrees Celsius.
+    
+    Returns:
+        The equivalent temperature in degrees Fahrenheit.
+    """
     return (celsius * 9/5) + 32