add 1 line about F_ effects for clarification

diff --git a/parts/Plugins.tex b/parts/Plugins.tex
index 20a9166dd8938e44a82102937da5931afc47a510..b246b578a1119b0886ab805068dff667994c0172 100644 (file)
--- a/parts/Plugins.tex
+++ b/parts/Plugins.tex
@@ -4,6 +4,9 @@
 
 There are realtime effects -- these are the most useful and probably all you will ever need -- and rendered effects.
 The rendered effects are discussed separately in the \nameref{sec:rendered_effects}  section.
+Effects that begin with the characters F\_ are effects that are part of the FFmpeg software
+as opposed to those coded within the \CGG{} program.  These are discussed separately in
+\nameref{sec:ffmpeg_audio_video_plugins}.
 Effect plugins modify the track when played, according to how they are set, with no permanent storage of the output except when the project is rendered. There are many Plugins in \CGG{} Infinity which are actually quite easy to use just by experimenting with them. The plugins are shown and selected from the \textit{Resources window} (figure~\ref{fig:video-plugins}). They are described in more detail later.
 
 \begin{figure}[htpb]