===========================
+Call sets
+---------
+
+Several tools take `CALLSET` arguments, e.g:
+
+ apitrace dump --calls CALLSET foo.trace
+ glretrace -S CALLSET foo.trace
+
+The call syntax is very flexible. Here are a few examples:
+
+ * `4` one call
+
+ * `1,2,4,5` set of calls
+
+ * `"1 2 4 5"` set of calls (commas are optional and can be replaced with whitespace)
+
+ * `1-100/2` calls 1, 3, 5, ..., 99
+
+ * `1-1000/draw` all draw calls between 1 and 1000
+
+ * `1-1000/fbo` all fbo changes between calls 1 and 1000
+
+ * `frame` all calls at end of frames
+
+ * `@foo.txt` read call numbers from `foo.txt`, using the same syntax as above
+
+
+
Tracing manually
----------------