diff --git a/add-interactive.c b/add-interactive.c
index 0d3792d13c17f6..a15bef17b658b4 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -8,6 +8,7 @@
 #include "string-list.h"
 #include "lockfile.h"
 #include "dir.h"
+#include "run-command.h"
 
 struct add_i_state {
 	struct repository *r;
@@ -375,7 +376,7 @@ static ssize_t list_and_choose(struct add_i_state *s,
 
 struct adddel {
 	uintmax_t add, del;
-	unsigned seen:1, binary:1;
+	unsigned seen:1, unmerged:1, binary:1;
 };
 
 struct file_item {
@@ -415,6 +416,7 @@ struct collection_status {
 	const char *reference;
 
 	unsigned skip_unseen:1;
+	size_t unmerged_count, binary_count;
 	struct string_list *files;
 	struct hashmap file_map;
 };
@@ -437,7 +439,7 @@ static void collect_changes_cb(struct diff_queue_struct *q,
 		int hash = strhash(name);
 		struct pathname_entry *entry;
 		struct file_item *file_item;
-		struct adddel *adddel;
+		struct adddel *adddel, *other_adddel;
 
 		entry = hashmap_get_entry_from_hash(&s->file_map, hash, name,
 						    struct pathname_entry, ent);
@@ -457,11 +459,21 @@ static void collect_changes_cb(struct diff_queue_struct *q,
 		file_item = entry->item;
 		adddel = s->phase == FROM_INDEX ?
 			&file_item->index : &file_item->worktree;
+		other_adddel = s->phase == FROM_INDEX ?
+			&file_item->worktree : &file_item->index;
 		adddel->seen = 1;
 		adddel->add = stat.files[i]->added;
 		adddel->del = stat.files[i]->deleted;
-		if (stat.files[i]->is_binary)
+		if (stat.files[i]->is_binary) {
+			if (!other_adddel->binary)
+				s->binary_count++;
 			adddel->binary = 1;
+		}
+		if (stat.files[i]->is_unmerged) {
+			if (!other_adddel->unmerged)
+				s->unmerged_count++;
+			adddel->unmerged = 1;
+		}
 	}
 	free_diffstat_info(&stat);
 }
@@ -475,7 +487,9 @@ enum modified_files_filter {
 static int get_modified_files(struct repository *r,
 			      enum modified_files_filter filter,
 			      struct prefix_item_list *files,
-			      const struct pathspec *ps)
+			      const struct pathspec *ps,
+			      size_t *unmerged_count,
+			      size_t *binary_count)
 {
 	struct object_id head_oid;
 	int is_initial = !resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
@@ -522,6 +536,10 @@ static int get_modified_files(struct repository *r,
 		}
 	}
 	hashmap_free_entries(&s.file_map, struct pathname_entry, ent);
+	if (unmerged_count)
+		*unmerged_count = s.unmerged_count;
+	if (binary_count)
+		*binary_count = s.binary_count;
 
 	/* While the diffs are ordered already, we ran *two* diffs... */
 	string_list_sort(&files->items);
@@ -604,7 +622,7 @@ static int run_status(struct add_i_state *s, const struct pathspec *ps,
 		      struct prefix_item_list *files,
 		      struct list_and_choose_options *opts)
 {
-	if (get_modified_files(s->r, NO_FILTER, files, ps) < 0)
+	if (get_modified_files(s->r, NO_FILTER, files, ps, NULL, NULL) < 0)
 		return -1;
 
 	list(s, &files->items, NULL, &opts->list_opts);
@@ -621,7 +639,7 @@ static int run_update(struct add_i_state *s, const struct pathspec *ps,
 	size_t count, i;
 	struct lock_file index_lock;
 
-	if (get_modified_files(s->r, WORKTREE_ONLY, files, ps) < 0)
+	if (get_modified_files(s->r, WORKTREE_ONLY, files, ps, NULL, NULL) < 0)
 		return -1;
 
 	if (!files->items.nr) {
@@ -700,7 +718,7 @@ static int run_revert(struct add_i_state *s, const struct pathspec *ps,
 	struct tree *tree;
 	struct diff_options diffopt = { NULL };
 
-	if (get_modified_files(s->r, INDEX_ONLY, files, ps) < 0)
+	if (get_modified_files(s->r, INDEX_ONLY, files, ps, NULL, NULL) < 0)
 		return -1;
 
 	if (!files->items.nr) {
@@ -852,6 +870,64 @@ static int run_add_untracked(struct add_i_state *s, const struct pathspec *ps,
 	return res;
 }
 
+static int run_patch(struct add_i_state *s, const struct pathspec *ps,
+		     struct prefix_item_list *files,
+		     struct list_and_choose_options *opts)
+{
+	int res = 0;
+	ssize_t count, i, j;
+	size_t unmerged_count = 0, binary_count = 0;
+
+	if (get_modified_files(s->r, WORKTREE_ONLY, files, ps,
+			       &unmerged_count, &binary_count) < 0)
+		return -1;
+
+	if (unmerged_count || binary_count) {
+		for (i = j = 0; i < files->items.nr; i++) {
+			struct file_item *item = files->items.items[i].util;
+
+			if (item->index.binary || item->worktree.binary) {
+				free(item);
+				free(files->items.items[i].string);
+			} else if (item->index.unmerged ||
+				 item->worktree.unmerged) {
+				color_fprintf_ln(stderr, s->error_color,
+						 _("ignoring unmerged: %s"),
+						 files->items.items[i].string);
+				free(item);
+				free(files->items.items[i].string);
+			} else
+				files->items.items[j++] = files->items.items[i];
+		}
+		files->items.nr = j;
+	}
+
+	if (!files->items.nr) {
+		if (binary_count)
+			fprintf(stderr, _("Only binary files changed.\n"));
+		else
+			fprintf(stderr, _("No changes.\n"));
+		return 0;
+	}
+
+	opts->prompt = N_("Patch update");
+	count = list_and_choose(s, files, opts);
+	if (count >= 0) {
+		struct argv_array args = ARGV_ARRAY_INIT;
+
+		argv_array_pushl(&args, "git", "add--interactive", "--patch",
+				 "--", NULL);
+		for (i = 0; i < files->items.nr; i++)
+			if (files->selected[i])
+				argv_array_push(&args,
+						files->items.items[i].string);
+		res = run_command_v_opt(args.argv, 0);
+		argv_array_clear(&args);
+	}
+
+	return res;
+}
+
 static int run_help(struct add_i_state *s, const struct pathspec *unused_ps,
 		    struct prefix_item_list *unused_files,
 		    struct list_and_choose_options *unused_opts)
@@ -949,6 +1025,7 @@ int run_add_i(struct repository *r, const struct pathspec *ps)
 		{ "update", run_update },
 		{ "revert", run_revert },
 		{ "add untracked", run_add_untracked },
+		{ "patch", run_patch },
 		{ "help", run_help },
 	};
 	struct prefix_item_list commands = PREFIX_ITEM_LIST_INIT;