Hi and welcome to the Kerbal Space Program wiki. As I don't know how familiar you are with wikis in general I just want to notify you that your change in Heat Shield (1.25m) has been reverted: http://wiki.kerbalspaceprogram.com/index.php?title=Heat_Shield_%281.25m%29&curid=8941&diff=64273&oldid=64272
Now I agree with Murph's argumentation that general stuff about a part category (e.g. heat shields) should go in their respective article: Heat shield. So if you want to improve the wiki I recommend to do that in the general article. A few things you should know is that we don't want that the reader is referenced (aka “no you”) and that “I” is used. The latter is basically because everyone can edit an article it's not possible to determine who “I” actually is.
Another thing is that currently file uploads aren't working (yet) so referencing screenshots is not possible. But when file upload works again please use a descriptive name and NOT screenshotA_NUMBER. If others see that file name they have no idea what this is about but a file name like “reentry on heat shield” or similar says more clearly to anyone what this is about.