Adding explanation for the use of `wtf_wikipedia` as parser.

data/wikibooks/wikibooks.md

@@ -85,6 +85,7 @@ To run the `create.py` file you first need to do:
 $ cd parser/ && npm install && cd ..
 ```
 
+We chose to use `wtf_wikipedia` because out of the other parsers we tested this was the imperically best one. We tested `mwparserfromhell`, `mediawiki_dump`, `wikiextractor`, and `wtf_wikipedia`. It seemed that the others still produced some sort of artifacts from the parsing of wikicode.
 
 ## Additional Information
 

data/wikipedia/wikipedia.md

@@ -88,6 +88,7 @@ To run the `create.py` file you first need to do:
 $ cd parser/ && npm install && cd ..
 ```
 
+We chose to use `wtf_wikipedia` because out of the other parsers we tested this was the imperically best one. We tested `mwparserfromhell`, `mediawiki_dump`, `wikiextractor`, and `wtf_wikipedia`. It seemed that the others still produced some sort of artifacts from the parsing of wikicode.
 
 ## Additional Information
 

data/wikisource/wikisource.md

@@ -84,6 +84,8 @@ To run the `create.py` file you first need to do:
 $ cd parser/ && npm install && cd ..
 ```
 
+We chose to use `wtf_wikipedia` because out of the other parsers we tested this was the imperically best one. We tested `mwparserfromhell`, `mediawiki_dump`, `wikiextractor`, and `wtf_wikipedia`. It seemed that the others still produced some sort of artifacts from the parsing of wikicode.
+
 ## Additional Information