Clarify 'fastboot flash' help.
Bug: http://b/80206492
Test: `fastboot --help`
Change-Id: Idd4305628836eb0bcbcf3d217db0a9fc54a1d6d6
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 6493262..5aa87d9 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -316,7 +316,8 @@
static int show_help() {
// clang-format off
fprintf(stdout,
-/* 1234567890123456789012345678901234567890123456789012345678901234567890123456 */
+// 1 2 3 4 5 6 7 8
+// 12345678901234567890123456789012345678901234567890123456789012345678901234567890
"usage: fastboot [OPTION...] COMMAND...\n"
"\n"
"flashing:\n"
@@ -324,8 +325,8 @@
" flashall Flash all partitions from $ANDROID_PRODUCT_OUT.\n"
" On A/B devices, flashed slot is set as active.\n"
" Secondary images may be flashed to inactive slot.\n"
- " flash PARTITION [FILENAME]\n"
- " Flash given partition only.\n"
+ " flash PARTITION [FILENAME] Flash given partition, using the image from\n"
+ " $ANDROID_PRODUCT_OUT if no filename is given.\n"
"\n"
"basics:\n"
" devices [-l] List devices in bootloader (-l: with device paths).\n"