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-rw-r--r--src/cam/main.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/cam/main.cpp b/src/cam/main.cpp
index 53c2ffde..c4e18a13 100644
--- a/src/cam/main.cpp
+++ b/src/cam/main.cpp
@@ -144,6 +144,8 @@ int CamApp::parseOptions(int argc, char *argv[])
"to write files, using the default file name. Otherwise it sets the\n"
"full file path and name. The first '#' character in the file name\n"
"is expanded to the camera index, stream name and frame sequence number.\n"
+ "If the file name ends with '.dng', then the frame will be written to\n"
+ "the output file(s) in DNG format.\n"
"The default file name is 'frame-#.bin'.",
"file", ArgumentOptional, "filename", false,
OptCamera);