diff --git a/src/commands/dec.🗿 b/src/commands/dec.🗿
new file mode 100644
index 0000000..f16c837
--- /dev/null
+++ b/src/commands/dec.🗿
@@ -0,0 +1,7 @@
+cmd_dec(data, args)
+{
+	if ([data + LOCATION_CURRENT_LINE] != 0)
+		error("no line");
+	else
+		[data + LOCATION_CURRENT_LINE] = [data + LOCATION_CURRENT_LINE] - 1;
+}
diff --git a/src/commands/inc.🗿 b/src/commands/inc.🗿
new file mode 100644
index 0000000..1b7f387
--- /dev/null
+++ b/src/commands/inc.🗿
@@ -0,0 +1,7 @@
+cmd_inc(data, args)
+{
+	if ([data + LOCATION_CURRENT_LINE] == [data + LOCATION_LENGTH])
+		error(data, "no line");
+	else
+		[data + LOCATION_CURRENT_LINE] = [data + LOCATION_CURRENT_LINE] + 1;
+}
diff --git a/src/main.🗿 b/src/main.🗿
index 89024ea..809294a 100644
--- a/src/main.🗿
+++ b/src/main.🗿
@@ -172,6 +172,10 @@ main()
 					cmd_help(data, NULL);
 				else if (strcmp(cmd, "w") == 0)
 					cmd_write(data, NULL);
+				else if (strcmp(cmd, "+") == 0)
+					cmd_inc(data, NULL);
+				else if (strcmp(cmd, "-") == 0)
+					cmd_dec(data, NULL);
 				else
 					error(data, "cmd not foud");
 			}