diff --git a/builtin-add.c b/builtin-add.c
index 871e23f0f6..7d1d5dc244 100644
--- a/builtin-add.c
+++ b/builtin-add.c
@@ -205,7 +205,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 	}
 
 	for (i = 0; i < dir.nr; i++)
-		add_file_to_index(dir.entries[i]->name, verbose);
+		add_file_to_cache(dir.entries[i]->name, verbose);
 
 	if (active_cache_changed) {
 		if (write_cache(newfd, active_cache, active_nr) ||
diff --git a/builtin-mv.c b/builtin-mv.c
index 737af350b8..c4ab4784ce 100644
--- a/builtin-mv.c
+++ b/builtin-mv.c
@@ -273,7 +273,7 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 
 		for (i = 0; i < added.nr; i++) {
 			const char *path = added.items[i].path;
-			add_file_to_index(path, verbose);
+			add_file_to_cache(path, verbose);
 		}
 
 		for (i = 0; i < deleted.nr; i++) {
diff --git a/cache.h b/cache.h
index 467e6a579a..ece0c041f5 100644
--- a/cache.h
+++ b/cache.h
@@ -187,7 +187,7 @@ extern int add_cache_entry(struct cache_entry *ce, int option);
 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 extern int remove_cache_entry_at(int pos);
 extern int remove_file_from_cache(const char *path);
-extern int add_file_to_index(const char *path, int verbose);
+extern int add_file_to_cache(const char *path, int verbose);
 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 extern int ce_match_stat(struct cache_entry *ce, struct stat *st, int);
 extern int ce_modified(struct cache_entry *ce, struct stat *st, int);
diff --git a/read-cache.c b/read-cache.c
index 747b50a99a..a8f8a6b2b2 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -325,7 +325,7 @@ int remove_file_from_cache(const char *path)
 	return 0;
 }
 
-int add_file_to_index(const char *path, int verbose)
+int add_file_to_cache(const char *path, int verbose)
 {
 	int size, namelen;
 	struct stat st;