diff --git a/config.def.h b/config.def.h
index 553940d..42fac92 100644
--- a/config.def.h
+++ b/config.def.h
@@ -1,26 +1,39 @@
-/* appearance */
-static const int sloppyfocus               = 1;  /* focus follows mouse */
-static const int bypass_surface_visibility = 0;  /* 1 means idle inhibitors will disable idle tracking even if it's surface isn't visible  */
-static const int smartborders        = 1;
-static unsigned int borderpx         = 1;  /* border pixel of windows */
-static float rootcolor[]             = {0.3, 0.3, 0.3, 1.0};
-static float bordercolor[]           = {0.5, 0.5, 0.5, 1.0};
-static float focuscolor[]            = {1.0, 0.0, 0.0, 1.0};
+/*
+ * Appearance
+ *
+ * Configurable by environment variables.
+ */
+static unsigned int borderpx = 1;  // DWL_BORDER
+static float rootcolor[]     = {0.3, 0.3, 0.3, 1.0}; // DWL_ROOT_COLOR
+static float bordercolor[]   = {0.5, 0.5, 0.5, 1.0}; // DWL_BORDER_COLOR
+static float focuscolor[]    = {1.0, 0.0, 0.0, 1.0}; // DWL_FOCUS_COLOR
+
+/*
+ * Behaviour
+ */
+static const int smartborders              = 1;
+static const int sloppyfocus               = 1;  // focus follows mouse
+static const int bypass_surface_visibility = 0;  // 1 means idle inhibitors will disable idle tracking even if it's surface isn't visible 
+static const int hide_type                 = 1;  // 1 means hide the cursor when typing
 /* To conform the xdg-protocol, set the alpha to zero to restore the old behavior */
 static const float fullscreen_bg[]         = {0.1, 0.1, 0.1, 1.0};
 
-/* Autostart */
+/*
+ * Autostart
+ */
 static const char *const autostart[] = {
         "wbg", "/path/to/your/image", NULL,
         NULL /* terminate */
 };
 
-/* tagging - tagcount must be no greater than 31 */
+/*
+ * Tagging
+ *
+ * tagcount must be no greater than 31
+ */
 #define TAGCOUNT (9)
 static const int tagcount = TAGCOUNT;
 
-static const int hide_type = 1;
-
 static const Rule rules[] = {
 	/* app_id     title       tags mask     isfloating   monitor */
 	/* examples:
@@ -29,7 +42,9 @@ static const Rule rules[] = {
 	{ "firefox",  NULL,       1 << 8,       0,           -1 },
 };
 
-/* layout(s) */
+/*
+ * Layout(s)
+ */
 static const Layout layouts[] = {
 	/* symbol     arrange function */
 	{ "[]=",      tile },
@@ -37,7 +52,9 @@ static const Layout layouts[] = {
 	{ "[M]",      monocle },
 };
 
-/* monitors */
+/*
+ * Monitors
+ */
 static const MonitorRule monrules[] = {
 	/* name       mfact nmaster scale layout       rotate/reflect                x    y */
 	/* example of a HiDPI laptop monitor:
@@ -47,7 +64,9 @@ static const MonitorRule monrules[] = {
 	{ NULL,       0.55, 1,      1,    &layouts[0], WL_OUTPUT_TRANSFORM_NORMAL,   -1,  -1 },
 };
 
-/* keyboard */
+/*
+ * Keyboard
+ */
 static const struct xkb_rule_names xkb_rules = {
 	/* can specify fields: rules, model, layout, variant, options */
 	/* example:
@@ -59,7 +78,9 @@ static const struct xkb_rule_names xkb_rules = {
 static const int repeat_rate = 25;
 static const int repeat_delay = 600;
 
-/* Trackpad */
+/*
+ * Trackpad
+ */
 static const int tap_to_click = 1;
 static const int tap_and_drag = 1;
 static const int drag_lock = 1;
@@ -67,6 +88,7 @@ static const int natural_scrolling = 0;
 static const int disable_while_typing = 1;
 static const int left_handed = 0;
 static const int middle_button_emulation = 0;
+
 /* You can choose between:
 LIBINPUT_CONFIG_SCROLL_NO_SCROLL
 LIBINPUT_CONFIG_SCROLL_2FG