diff --git a/History.md b/History.md
new file mode 100644
index 0000000..7dac523
--- /dev/null
+++ b/History.md
@@ -0,0 +1,8 @@
+
+0.1.0 / 2013-08-29 
+==================
+
+ * add auto delay
+ * add .rate option
+ * add garbage collection of tmpfiles
+ * use gm instead of gifsickle
diff --git a/index.js b/index.js
index 0771028..e684cb8 100644
--- a/index.js
+++ b/index.js
@@ -79,8 +79,8 @@ function gify(input, output, opts, fn) {
     cmd.push('-i', input);
     cmd.push('-filter:v', 'scale=' + scale);
     cmd.push('-r', String(rate));
-    opts.start && cmd.push('-ss', String(opts.start));
-    opts.duration && cmd.push('-t', String(opts.duration));
+    if (opts.start) cmd.push('-ss', String(opts.start));
+    if (opts.duration) cmd.push('-t', String(opts.duration));
     cmd.push(tmp);
     cmd = escape(cmd);