+There are several documents describing the original version of QC as used in Quake 1:
+- an [old version](http://www.gamers.org/dEngine/quake/spec/quake-spec34/index1.htm) which is a part of unofficial [Quake Documentation](http://www.gamers.org/dEngine/quake/spec/quake-spec34/)
+- a probably slightly [newer version](http://www.cataboligne.org/extra/qcmanual.html)
+- a [newer and extended version](http://pages.cs.wisc.edu/~jeremyp/quake/quakec/quakec.pdf) in PDF
+
+Even this page is outdated and incomplete, not all GMQCC QuakeC constructs are described here and some of the bugs mentioned here have already been fixed.
+
+Other resources
+---------------
+
+- [QC Tutorial for Absolute Beginners](https://web.archive.org/web/20091118154016/http://forums.inside3d.com/viewtopic.php?t=1286)
+- [List of builtins on quakewiki.org](https://quakewiki.org/wiki/List_of_builtin_functions)
+- comments and `doc.md` in the `qcsrc/dpdefs` directory
+