diff --git a/docs/usage.md b/docs/usage.md
index 0dccf181..bbcfaf5d 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -98,14 +98,12 @@ Alternatively, the RNA premapping reference can be supplied by the user by givin
 
 By default, peak calling on identified crosslinks is not performed unless specified using the `--peakcaller` argument. Currently the following peak callers are implemented:
 
-* [iCount](https://icount.readthedocs.io/en/latest/)
-  * `--peakcaller icount`
-* [Paraclu](http://cbrc3.cbrc.jp/~martin/paraclu/)
-  * `--peakcaller paraclu`
-* [PureCLIP](https://pureclip.readthedocs.io/en/latest/)
-  * `--peakcaller pureclip`
-* [Piranha](https://github.com/smithlabcode/piranha)
-  * `--peakcaller piranha`
+| Peak caller                                            | Argument                | Supported protocols                        |
+|--------------------------------------------------------|-------------------------|--------------------------------------------|
+| [iCount](https://icount.readthedocs.io/en/latest/)     | `--peakcaller icount`   | iCLIP                                      |
+| [Paraclu](https://gitlab.com/mcfrith/paraclu)          | `--peakcaller paraclu`  | CAGE-seq                                   |
+| [PureCLIP](https://pureclip.readthedocs.io/en/latest/) | `--peakcaller pureclip` | iCLIP, eCLIP                               |
+| [Piranha](https://github.com/smithlabcode/piranha)     | `--peakcaller piranha`  | HITS-CLIP, iCLIP, eCLIP, PAR-CLIP, RIP-seq |
 
 Multiple peak callers can specified separated using a comma, e.g. `--peakcaller icount,paraclu`. As a short-hand, all peak callers can be specified using `--peakcaller all`.