diff --git a/chap/gif89a.tex b/chap/gif89a.tex
index 7f9a738..9057003 100644
--- a/chap/gif89a.tex
+++ b/chap/gif89a.tex
@@ -86,3 +86,15 @@ indoor.gif:	$(DEPS)
 
 
 % ==================================================================
+
+\section{gifsicle}
+
+'Gifsicle' manipulates GIF images. Its most common uses include combining
+single images into animations, adding transparency, optimizing animations for
+space, and printing information about GIFs.
+
+
+
+% ==================================================================
+
+