diff --git a/doc/nvim-ts-context-commentstring.txt b/doc/nvim-ts-context-commentstring.txt
index b5fe6a2..e691eb4 100644
--- a/doc/nvim-ts-context-commentstring.txt
+++ b/doc/nvim-ts-context-commentstring.txt
@@ -29,6 +29,7 @@ language tree (see `lua/ts_context_commentstring/internal.lua`):
 - `php`
 - `python`
 - `rescript`
+- `roc`
 - `scss`
 - `shell`
 - `sql`
diff --git a/lua/ts_context_commentstring/config.lua b/lua/ts_context_commentstring/config.lua
index 3aa2f98..a3e852a 100644
--- a/lua/ts_context_commentstring/config.lua
+++ b/lua/ts_context_commentstring/config.lua
@@ -89,6 +89,7 @@ M.config = {
     vue = '<!-- %s -->',
     zsh = '# %s',
     kotlin = { __default = '// %s', __multiline = '/* %s */' },
+    roc = '# %s',
 
     -- Languages that can have multiple types of comments
     tsx = {