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 # opendeco
 
-Implementation of Buhlmann ZH-L16 with Gradient Factors
+```Usage: opendeco [OPTION...]
+Implementation of Buhlmann ZH-L16 with Gradient Factors:
+
+  -d, --depth=NUMBER         Set the depth of the dive in meters
+  -t, --time=NUMBER          Set the time of the dive in minutes
+  -g, --gas=STRING           Set the bottom gas used during the dive, defaults
+                             to Air
+  -l, --gflow=NUMBER         Set the gradient factor at the first stop,
+                             defaults to 30
+  -h, --gfhigh=NUMBER        Set the gradient factor at the surface, defaults
+                             to 75
+  -G, --decogasses=LIST      Set the gasses available for deco
+  -?, --help                 Give this help list
+      --usage                Give a short usage message
+  -V, --version              Print program version
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+Examples:
+
+        ./opendeco -d 18 -t 60 -g Air
+        ./opendeco -d 30 -t 60 -g EAN32
+        ./opendeco -d 40 -t 120 -g 21/35 -l 20 -h 80 --decogasses Oxygen,EAN50
+
+Report bugs to <~tsegers/opendeco@lists.sr.ht>.
+```