Index: README.md
==================================================================
--- README.md
+++ README.md
@@ -34,11 +34,18 @@
    - The Tcl package [dns](https://core.tcl.tk/tcllib/dir?ci=trunk&name=modules/dns&type=tree)
    - The Tcl package [defer](https://core.tcl.tk/tcllib/dir?ci=trunk&name=modules/defer&type=tree)
    - The Tcl package [lmdb](https://github.com/ray2501/tcl-lmdb)
    - The Tcl package [udp](http://tcludp.sourceforge.net/)
    - The Tcl package [tclreadline](http://tclreadline.sourceforge.net/)
+   - The curl command
+
+On a Debian system you should be able to do the following (to use the package):
+
+```
+$ sudo apt install -y tcl8.6 tcllib tcl-udp tcl-tclreadline curl
+```
 
-On a Debian system you should be able to do the following:
+The following packages are sufficient to compile the package:
 
 ```
-$ sudo apt install -y tcl8.6 tcllib tcl-udp tcl-tclreadline
+$ sudo apt install -y build-essential tcl8.6-dev
 ```