diff --git a/libfdisk/src/ask.c b/libfdisk/src/ask.c
index da5746c68..eb386ace9 100644
--- a/libfdisk/src/ask.c
+++ b/libfdisk/src/ask.c
@@ -280,7 +280,16 @@ static char *mk_string_list(char *ptr, size_t *len, size_t *begin,
 	return ptr;
 }
 
-/* returns: 1=0 on success, < 0 on error, 1 if no free/used partition */
+/**
+ * fdisk_ask_partnum:
+ * @cxt: context
+ * @partnum: returns partition number
+ * @wantnew: 0|1
+ *
+ * This function uses libfdisk Ask API to get a partition number.
+ *
+ * Returns: 0 on success, < 0 on error, 1 if no free/used partition
+ */
 int fdisk_ask_partnum(struct fdisk_context *cxt, size_t *partnum, int wantnew)
 {
 	int rc = 0, inchar = 0;
diff --git a/libfdisk/src/fdiskP.h b/libfdisk/src/fdiskP.h
index 46adc058a..5a4249e09 100644
--- a/libfdisk/src/fdiskP.h
+++ b/libfdisk/src/fdiskP.h
@@ -403,8 +403,6 @@ extern int fdisk_probe_labels(struct fdisk_context *cxt);
 extern void fdisk_deinit_label(struct fdisk_label *lb);
 
 /* ask.c */
-extern int fdisk_ask_partnum(struct fdisk_context *cxt, size_t *partnum, int wantnew);
-
 extern int fdisk_info_new_partition(
 			struct fdisk_context *cxt,
 			int num, sector_t start, sector_t stop,
diff --git a/libfdisk/src/libfdisk.h b/libfdisk/src/libfdisk.h
index 803866ba4..7bb6dd8fc 100644
--- a/libfdisk/src/libfdisk.h
+++ b/libfdisk/src/libfdisk.h
@@ -477,6 +477,7 @@ extern int fdisk_ask_menu_get_item(struct fdisk_ask *ask, size_t idx, int *key,
 extern int fdisk_ask_menu_add_item(struct fdisk_ask *ask, int key,
 			const char *name, const char *desc);
 
+extern int fdisk_ask_partnum(struct fdisk_context *cxt, size_t *partnum, int wantnew);
 
 #ifdef __cplusplus
 }