--- modemmanager-1.8.2.ebuild.ori	2018-10-08 11:34:47.436395010 +0200
+++ modemmanager-1.8.2.ebuild	2018-10-08 11:47:28.867803491 +0200
@@ -42,9 +42,17 @@
 
 src_prepare() {
 	DOC_CONTENTS="
-		If your USB modem shows up only as a storage device when you plug it in,
-		then you should install sys-apps/usb_modeswitch, which will automatically
-		switch it over to USB modem mode whenever you plug it in.\n"
+		USB 2G/3G/LTE modems show up by default only as a CDROM storage device with MS Win
+		drivers when you plug them in. Once the /dev/sr* is 'ejected' their firmware
+		switches into modem mode and also their eventual SDcard slot is exposed to the
+		host computer. While you can use 'eject /dev/sr*' command to that manually
+		sys-apps/usb_modeswitch will do this automatically whenever you plug the device
+		in (that can be seen in syslog records). The USB ID number of the CDROM (/dev/sr*)
+		interface differs from those of the modem (/dev/USB*) and of the SD card reader.\n
+		Use dmesg and lsusb to firgure out IDs of your device.\n
+		For example, firmware of Huawei E3131 must switch from 12d1:15ca to 12d1:1506 to
+		expose its three /dev/ttyUSB* and one /dev/sr* interfaces. The command is:
+		usb_modeswitch -J -v 0x12d1 -p 0x15ca\n"
 
 	if use policykit; then
 		DOC_CONTENTS+="\nTo control your modem without needing to enter the root password,