diff --git a/internal/repo/client.go b/internal/repo/client.go
index c39932d..f0eb123 100644
--- a/internal/repo/client.go
+++ b/internal/repo/client.go
@@ -19,12 +19,18 @@ type GetRepositoryMethod func(username, repositoryName string) (Repository, erro
 // <username>/<repository>@<branch> exists. If not, returns "", error.
 type GetFileMethod func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error)
 
+// Returns the result of a CNAME lookup for @domain.
 type LookupCNAMEMethod func(domain string) (string, error)
 
+// Return the repository the domain should point to by looking up the TXT record
+// "_rio-pages.<domain>".
 type LookupRepoTXTMethod func(domain string) (string, error)
 
+// Check of the repository <username>/<repositoryName> contains the specified
+// branch.
 type HasBranchMethod func(username, repositoryName, branchName string) bool
 
+// Check if the specified username exists.
 type HasUserMethod func(username string) bool
 
 type Repository struct {