Merge pull request #179 from rocket-3/patch-1

Add a note and some formatting in readme.md/How to format

Author: yegor256

README.md

@@ -78,8 +78,9 @@ to the leading space in every consecutive line):
 [related code]
 ```
 
-\[\] - Replace with apropriate data (see text enclosed in brackets)
-<> - Omitable (enclosed data can be left out)
+`[]` - Replace with apropriate data (see text enclosed in brackets)
+
+`<>` - Omitable (enclosed data can be left out)
 
 Example:
 
@@ -101,6 +102,9 @@ The specified markers will be included in the issues body
 along with some predefined text. If your comment is longer
 than 40 characters, it will be truncated in the title.
 
+Note: if you create several puzzle duplicates (same text after puzzle keyword),
+pdd will fail to parse puzzles and produce an error with duplicates list.
+
 There are 3 supported keywords, one of which must precede the mandatory
 puzzle marker. They are `@todo`, `TODO` and `TODO:`.