diff --git a/README.md b/README.md
index bd7ab10..2cc44cf 100644
--- a/README.md
+++ b/README.md
@@ -23,9 +23,10 @@ using an external programmer. See [flashing](./docs/flashing.md) for details.
 
 ### Schematics
 
-Board schematics can be provided on request by sending an email to
+System76 customers may request board schematics by sending an email to
 firmware@system76.com with the subject line  "Schematics for _model_", where
 _model_ is the name of a directory in the `models/` directory, such as darp6.
+Please include the serial number of your system for verification.
 
 You may not share these without explicit permission from System76.
 
diff --git a/README.md.in b/README.md.in
index 2cc503e..64519e1 100644
--- a/README.md.in
+++ b/README.md.in
@@ -23,9 +23,10 @@ using an external programmer. See [flashing](./docs/flashing.md) for details.
 
 ### Schematics
 
-Board schematics can be provided on request by sending an email to
+System76 customers may request board schematics by sending an email to
 firmware@system76.com with the subject line  "Schematics for _model_", where
 _model_ is the name of a directory in the `models/` directory, such as darp6.
+Please include the serial number of your system for verification.
 
 You may not share these without explicit permission from System76.
 
diff --git a/scripts/modeltool/Cargo.lock b/scripts/modeltool/Cargo.lock
index 44b19e0..c319e12 100644
--- a/scripts/modeltool/Cargo.lock
+++ b/scripts/modeltool/Cargo.lock
@@ -2,7 +2,7 @@
 # It is not intended for manual editing.
 [[package]]
 name = "bitflags"
-version = "1.0.4"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -10,7 +10,7 @@ name = "modeltool"
 version = "0.1.0"
 dependencies = [
  "redox_intelflash 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "system76_ecflash 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "system76_ecflash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -23,7 +23,7 @@ name = "redox_intelflash"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "plain 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_uefi 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -35,12 +35,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "system76_ecflash"
-version = "0.1.0"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
-"checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
+"checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 "checksum plain 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b4596b6d070b27117e987119b4dac604f3c58cfb0b191112e24771b2faeac1a6"
 "checksum redox_intelflash 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "49e6f45d8c070090589005869e0b776f52c735f9b5411fca369229135fa1dbd8"
 "checksum redox_uefi 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dafc50645c27c55ca19d27645a6d91e2a8cbc7aabb2ed024ce914512c75e1217"
-"checksum system76_ecflash 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d2a81b23cd826ce944029420978cce3be94363188ed87ff8cc0778f80adac547"
+"checksum system76_ecflash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "18ead2ebfbf58e9ddf09b21562f834c1846e92553069120247568c3213c3a9fc"