diff --git a/doc/Screen Shot sea.png b/doc/Screen_Shot_sea.png
similarity index 100%
rename from doc/Screen Shot sea.png
rename to doc/Screen_Shot_sea.png
diff --git a/doc/urls for graphics.txt b/doc/urls_for_graphics.txt
similarity index 100%
rename from doc/urls for graphics.txt
rename to doc/urls_for_graphics.txt