diff --git a/docs/INSTALL-CMAKE.md b/docs/INSTALL-CMAKE.md
index e6b52a17ee..bfc1e451f2 100644
--- a/docs/INSTALL-CMAKE.md
+++ b/docs/INSTALL-CMAKE.md
@@ -482,6 +482,7 @@ Examples:
 
 - `APXS`:                                   Absolute path. Default: search for `apxs`
 - `CADDY`:                                  Absolute path. Default: search for `caddy`
+- `H2O`:                                    Absolute path. Default: search for `h2o`
 - `HTTPD_NGHTTPX`:                          Absolute path. Default: search for `nghttpx`
 - `HTTPD`:                                  Absolute path. Default: search for `apache2`
 - `DANTED`:                                 Absolute path. Default: search for `danted`