diff --git a/.gitignore b/.gitignore
index f6f1e54d..36e8ba58 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,10 +21,11 @@ Thumbs.db
 [Bb]in
 [Dd]ebug*/
 *.lib
+*.a
 *.sbr
 obj/
 [Rr]elease*/
 _ReSharper*/
 [Tt]est[Rr]esult*
 *.suo
-*.sdf
\ No newline at end of file
+*.sdf
diff --git a/extrlib/readme (2).txt b/extrlib/readme (2).txt
new file mode 100644
index 00000000..84359ae5
--- /dev/null
+++ b/extrlib/readme (2).txt	
@@ -0,0 +1 @@
+The libpng.a is for MinGW(Not linux), and other .lib files are for VS2013
\ No newline at end of file