added documentation

README.pod

@@ -86,7 +86,7 @@ see also EXAMPLES show the notification on monitor n.
 
 =item B<-shrink>
 
-TODO
+Shrink window if it's smaller than the width. Will be ignored if width is 0.
 
 =item B<-lh/-line_height> height
 

dunstrc

@@ -61,7 +61,7 @@
     # screen width minus the width defined in within the geometry option.
     geometry = "300x5-30+20"
 
-    # TODO
+    # Shrink window if it's smaller than the width. Will be ignored if width is 0.
     shrink = no
 
     # The transparency of the window. range: [0; 100]

settings.c

@@ -104,7 +104,7 @@ void load_settings(char *cmdline_config_path)
         settings.shrink =
             option_get_bool("global", "shrink", "-shrink",
                             shrink,
-                            ""); // TODO
+                            "Shrink window if it's smaller than the width");
         settings.line_height =
             option_get_int("global", "line_height", "-lh/-line_height",
                            line_height,