diff --git a/catalogue/catalogue.go b/catalogue/catalogue.go
index 32856933..f9cdebd9 100644
--- a/catalogue/catalogue.go
+++ b/catalogue/catalogue.go
@@ -148,6 +148,7 @@ func (r RecipeCatalogue) Flatten() []Recipe {
 	return recipes
 }
 
+// ByRecipeName sorts recipes by name.
 type ByRecipeName []Recipe
 
 func (r ByRecipeName) Len() int      { return len(r) }
@@ -156,6 +157,8 @@ func (r ByRecipeName) Less(i, j int) bool {
 	return strings.ToLower(r[i].Name) < strings.ToLower(r[j].Name)
 }
 
+// recipeCatalogueFSIsLatest checks whether the recipe catalogue stored locally
+// is up to date.
 func recipeCatalogueFSIsLatest() (bool, error) {
 	httpClient := &http.Client{Timeout: web.Timeout}
 	res, err := httpClient.Head(RecipeCatalogueURL)
@@ -186,6 +189,7 @@ func recipeCatalogueFSIsLatest() (bool, error) {
 	return true, nil
 }
 
+// ReadRecipeCatalogue reads the recipe catalogue.
 func ReadRecipeCatalogue() (RecipeCatalogue, error) {
 	recipes := make(RecipeCatalogue)
 
@@ -208,6 +212,7 @@ func ReadRecipeCatalogue() (RecipeCatalogue, error) {
 	return recipes, nil
 }
 
+// readRecipeCatalogueFS reads the catalogue from the file system.
 func readRecipeCatalogueFS(target interface{}) error {
 	recipesJSONFS, err := ioutil.ReadFile(config.APPS_JSON)
 	if err != nil {
@@ -219,6 +224,7 @@ func readRecipeCatalogueFS(target interface{}) error {
 	return nil
 }
 
+// readRecipeCatalogueWeb reads the catalogue from the web.
 func readRecipeCatalogueWeb(target interface{}) error {
 	if err := web.ReadJSON(RecipeCatalogueURL, &target); err != nil {
 		return err
@@ -236,6 +242,7 @@ func readRecipeCatalogueWeb(target interface{}) error {
 	return nil
 }
 
+// VersionsOfService lists the version of a service.
 func VersionsOfService(recipe, serviceName string) ([]string, error) {
 	catalogue, err := ReadRecipeCatalogue()
 	if err != nil {