vulkaninfo: add documentation for --show-formats

A recent PR was merged that made format properties not shown by
default in the text output. This documents the change in the options
list of the executable.

files changed
 - vulkaninfo/vulkaninfo.cpp

Change-Id: I1db65f8c9fae31dd047856d0f0d483a304405dd2

1 files changed, 2 insertions, 1 deletions

diff --git a/vulkaninfo/vulkaninfo.cpp b/vulkaninfo/vulkaninfo.cpp
index 75a653d8..7a8fb3ce 100644
--- a/vulkaninfo/vulkaninfo.cpp
+++ b/vulkaninfo/vulkaninfo.cpp
@@ -667,7 +667,8 @@ void print_usage(const char *argv0) {
     std::cout << "--json=<gpu-number>   For a multi-gpu system, a single gpu can be targetted by\n";
     std::cout << "                      specifying the gpu-number associated with the gpu of \n";
     std::cout << "                      interest. This number can be determined by running\n";
-    std::cout << "                      vulkaninfo without any options specified.\n\n";
+    std::cout << "                      vulkaninfo without any options specified.\n";
+    std::cout << "--show-formats        Display the format properties of each physical device.\n\n";
 }
 
 int main(int argc, char **argv) {