diff --git a/CHANGELOG.md b/CHANGELOG.md
index b14954a..49afbb8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ This project adheres to [Semantic Versioning](https://semver.org), except that 
 
 Do not manually edit this file. It will be automatically updated when a new release is published.
 
+## 0.9.13
+_20 November 2024_
+
+* enlarged description of c2pa command-line behavior ([#285](https://github.com/contentauth/c2patool/pull/285))
 ## 0.9.12
 _18 October 2024_
 
diff --git a/Cargo.lock b/Cargo.lock
index 09afe16..bfbb80d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -469,6 +469,12 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "base16ct"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c7f02d4ea65f2c1853089ffd8d2787bdbc63de2f0d29dedbcf8ccdfa0ccd4cf"
+
 [[package]]
 name = "base64"
 version = "0.21.7"
@@ -628,20 +634,20 @@ checksum = "428d9aa8fbc0670b7b8d6030a7fadd0f86151cae55e4dbbece15f3780a3dfaf3"
 
 [[package]]
 name = "c2pa"
-version = "0.37.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b5cb9c3ba71a4979f7d5050c50c2e33c01ca9ee7c4657a7ec50e8644ac9e052"
+version = "0.40.0-nightly+2024-11-20-12e1bfe"
+source = "git+https://github.com/contentauth/c2pa-rs.git?branch=nightly#fffa0a0c39f9cf8775a0df0a7aabff3ad9a91247"
 dependencies = [
  "asn1-rs 0.5.2",
  "async-generic",
  "async-recursion",
  "async-trait",
  "atree",
- "base64 0.22.1",
  "bcder",
  "byteorder",
  "byteordered",
  "bytes",
+ "c2pa-crypto",
+ "c2pa-status-tracker",
  "chrono",
  "ciborium",
  "config",
@@ -701,9 +707,49 @@ dependencies = [
  "zip",
 ]
 
+[[package]]
+name = "c2pa-crypto"
+version = "0.1.2"
+source = "git+https://github.com/contentauth/c2pa-rs.git?branch=nightly#fffa0a0c39f9cf8775a0df0a7aabff3ad9a91247"
+dependencies = [
+ "base64 0.22.1",
+ "bcder",
+ "c2pa-status-tracker",
+ "chrono",
+ "ecdsa",
+ "ed25519-dalek",
+ "getrandom",
+ "hex",
+ "js-sys",
+ "openssl",
+ "p256",
+ "p384",
+ "rasn",
+ "rasn-ocsp",
+ "rasn-pkix",
+ "rsa",
+ "serde",
+ "sha1",
+ "spki",
+ "thiserror",
+ "ureq",
+ "url",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "web-time",
+ "x509-certificate",
+ "x509-parser",
+]
+
+[[package]]
+name = "c2pa-status-tracker"
+version = "0.1.0"
+source = "git+https://github.com/contentauth/c2pa-rs.git?branch=nightly#fffa0a0c39f9cf8775a0df0a7aabff3ad9a91247"
+
 [[package]]
 name = "c2patool"
-version = "0.9.12"
+version = "0.9.13-nightly+2024-11-20-ebfe851"
 dependencies = [
  "anyhow",
  "assert_cmd",
@@ -987,6 +1033,18 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
 
+[[package]]
+name = "crypto-bigint"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
+dependencies = [
+ "generic-array",
+ "rand_core 0.6.4",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.1.6"
@@ -1121,6 +1179,7 @@ dependencies = [
  "block-buffer",
  "const-oid",
  "crypto-common",
+ "subtle",
 ]
 
 [[package]]
@@ -1176,6 +1235,20 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
 
+[[package]]
+name = "ecdsa"
+version = "0.16.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee27f32b5c5292967d2d4a9d7f1e0b0aed2c15daded5a60300e4abb9d8020bca"
+dependencies = [
+ "der",
+ "digest",
+ "elliptic-curve",
+ "rfc6979",
+ "signature",
+ "spki",
+]
+
 [[package]]
 name = "ed25519"
 version = "2.2.3"
@@ -1206,6 +1279,27 @@ version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
 
+[[package]]
+name = "elliptic-curve"
+version = "0.13.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
+dependencies = [
+ "base16ct",
+ "crypto-bigint",
+ "digest",
+ "ff",
+ "generic-array",
+ "group",
+ "hkdf",
+ "pem-rfc7468",
+ "pkcs8",
+ "rand_core 0.6.4",
+ "sec1",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "ena"
 version = "0.14.3"
@@ -1320,6 +1414,16 @@ dependencies = [
  "simd-adler32",
 ]
 
+[[package]]
+name = "ff"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
+dependencies = [
+ "rand_core 0.6.4",
+ "subtle",
+]
+
 [[package]]
 name = "fiat-crypto"
 version = "0.2.9"
@@ -1476,6 +1580,7 @@ checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
 dependencies = [
  "typenum",
  "version_check",
+ "zeroize",
 ]
 
 [[package]]
@@ -1515,6 +1620,17 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "group"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
+dependencies = [
+ "ff",
+ "rand_core 0.6.4",
+ "subtle",
+]
+
 [[package]]
 name = "h2"
 version = "0.4.6"
@@ -1607,6 +1723,24 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
+[[package]]
+name = "hkdf"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b5f8eb2ad728638ea2c7d47a21db23b7b58a72ed6a38256b8a1849f15fbbdf7"
+dependencies = [
+ "hmac",
+]
+
+[[package]]
+name = "hmac"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
+dependencies = [
+ "digest",
+]
+
 [[package]]
 name = "http"
 version = "0.2.12"
@@ -2425,6 +2559,30 @@ dependencies = [
  "hashbrown 0.13.2",
 ]
 
+[[package]]
+name = "p256"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
+dependencies = [
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "sha2",
+]
+
+[[package]]
+name = "p384"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70786f51bcc69f6a4c0360e063a4cac5419ef7c5cd5b3c99ad70f3be5ba79209"
+dependencies = [
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "sha2",
+]
+
 [[package]]
 name = "parking"
 version = "2.2.1"
@@ -2711,6 +2869,15 @@ dependencies = [
  "termtree",
 ]
 
+[[package]]
+name = "primeorder"
+version = "0.13.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "353e1ca18966c16d9deb1c69278edbc5f194139612772bd9537af60ac231e1e6"
+dependencies = [
+ "elliptic-curve",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.88"
@@ -2955,6 +3122,16 @@ dependencies = [
  "windows-registry",
 ]
 
+[[package]]
+name = "rfc6979"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8dd2a808d456c4a54e300a23e9f5a67e122c3024119acbfd73e3bf664491cb2"
+dependencies = [
+ "hmac",
+ "subtle",
+]
+
 [[package]]
 name = "riff"
 version = "2.0.0"
@@ -3148,6 +3325,20 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
+[[package]]
+name = "sec1"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
+dependencies = [
+ "base16ct",
+ "der",
+ "generic-array",
+ "pkcs8",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "security-framework"
 version = "2.11.1"
@@ -4027,6 +4218,16 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "web-time"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a6580f308b1fad9207618087a65c04e7a10bc77e02c8e84e9b00dd4b12fa0bb"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "webpki-roots"
 version = "0.26.6"
diff --git a/Cargo.toml b/Cargo.toml
index 8f15d9a..c9e92e4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,7 @@ default-run = "c2patool"
 # Please do not manually edit `version`. Version updates will be generated
 # automatically when c2patool is published. Remember to use (MINOR) or (MAJOR)
 # tags in the PR title to trigger non-patch updates as needed.
-version = "0.9.12"
+version = "0.9.13-nightly+2024-11-20-ebfe851"
 
 description = "Tool for displaying and creating C2PA manifests."
 authors = [
@@ -22,7 +22,7 @@ repository = "https://github.com/contentauth/c2patool"
 
 [dependencies]
 anyhow = "1.0"
-c2pa = { version = "0.37.0", features = [
+c2pa = { git = "https://github.com/contentauth/c2pa-rs.git", branch = "nightly", features = [
 	"fetch_remote_manifests",
 	"file_io",
 	"add_thumbnails",