diff --git a/.gitignore b/.gitignore
index 388d32b66..a214d3761 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,9 +50,12 @@ Tests/*Cases/*.js
 /jsil.org/demos/demos.zip
 /Examples/obj
 /Upstream/dxtc.cpp
-/Upstream/LAME
-/Upstream/FFMPEG
-/Upstream/OggEnc
+/Upstream/LAME/*.exe
+/Upstream/LAME/*.dll
+/Upstream/FFMPEG/*.dll
+/Upstream/FFMPEG/*.exe
+/Upstream/FFMPEG/licenses
+/Upstream/OggEnc/*.exe
 /Upstream/XapParse/obj
 /Upstream/XapParse/bin
 Skeletons/*.js
diff --git a/Upstream/FFMPEG/readme.txt b/Upstream/FFMPEG/readme.txt
new file mode 100644
index 000000000..97a004564
--- /dev/null
+++ b/Upstream/FFMPEG/readme.txt
@@ -0,0 +1 @@
+You need to include a command-line version of FFMPEG (ffmpeg.exe) in this folder for JSIL to be able to process audio content that is not stored in .wav format (i.e. if your sounds are already encoded to MP3 or WMA).
\ No newline at end of file
diff --git a/Upstream/LAME/readme.txt b/Upstream/LAME/readme.txt
new file mode 100644
index 000000000..750a66a7d
--- /dev/null
+++ b/Upstream/LAME/readme.txt
@@ -0,0 +1 @@
+For JSIL to automatically convert your sound assets to MP3, you need to put a version of the LAME MP3 encoder in this folder (lame.exe). The version used by Audacity should work fine.
\ No newline at end of file
diff --git a/Upstream/OggEnc/readme.txt b/Upstream/OggEnc/readme.txt
new file mode 100644
index 000000000..799ebc0a2
--- /dev/null
+++ b/Upstream/OggEnc/readme.txt
@@ -0,0 +1 @@
+For JSIL to automatically convert your sound assets to OGG, you need to put a version of the command line OGG Vorbis encoder in this folder (oggenc2.exe).
\ No newline at end of file