Update comments

pdfsearch/pdfsearch.py

@@ -86,9 +86,10 @@ def search_pdf(pdf_name, search_patterns, context_length):
 
             for pattern in search_patterns:
                 if pattern == pattern.lower():
-                    # Find case-insensitive matches if pattern is all lowercase
+                    # Ignore case if pattern is all lowercase
                     matches = re.finditer(pattern, page_text.lower())
                 else:
+                    # Respect case if pattern is mixed or uppercase
                     matches = re.finditer(pattern, page_text)
 
                 for match in matches: