diff --git a/include/keyb.h b/include/keyb.h
index b2d3b323..8aaeaa76 100644
--- a/include/keyb.h
+++ b/include/keyb.h
@@ -186,6 +186,9 @@ gboolean parse_keys_abe(NkBindings *bindings);
  */
 void setup_abe(void);
 
+/**
+ * List all available key bindings to the terminal.
+ */
 void abe_list_all_bindings(gboolean is_term);
 /**
  * @param name Don't have the name.
diff --git a/include/theme.h b/include/theme.h
index 45faa67c..ec12390b 100644
--- a/include/theme.h
+++ b/include/theme.h
@@ -142,9 +142,11 @@ void rofi_theme_property_free(Property *p);
 /**
  * @param p The property to free.
  *
+ * Make a newly allocted copy of the property.
+ *
  * @returns a copy of p
  */
-Property *rofi_theme_property_copy(const Property *p, void *);
+Property *rofi_theme_property_copy(const Property *p, G_GNUC_UNUSED void *);
 /**
  * @param widget
  *
@@ -463,9 +465,24 @@ void rofi_theme_free_parsed_files(void);
 void rofi_theme_print_parsed_files(int is_term);
 
 /**
+ * @param widget The widget handle.
+ * @param property The property to query.
+ *
  * Returns a list of allocated RofiDistance objects that should be
  * freed.
+ *
+ * @returns a GList of  RofiDistance objects.
  */
 GList *rofi_theme_get_list_distance(const widget *widget, const char *property);
+
+/**
+ * @param widget The widget handle.
+ * @param property The property to query.
+ *
+ * Returns a list of allocated strings othat should be
+ * freed.
+ *
+ * @returns a GList of strings.
+ */
 GList *rofi_theme_get_list_strings(const widget *widget, const char *property);
 #endif
diff --git a/include/view-internal.h b/include/view-internal.h
index 28ab47f3..7779ae3b 100644
--- a/include/view-internal.h
+++ b/include/view-internal.h
@@ -107,7 +107,9 @@ struct RofiViewState {
   /** filtered rows */
   textbox *tb_filtered_rows;
 
+  /** Extra icon widget that shows the current selected entries text. */
   textbox *tb_current_entry;
+  /** Extra icon widget that shows the current selected entries icon. */
   icon *icon_current_entry;
 
   /** Settings of the menu */
diff --git a/include/widgets/textbox.h b/include/widgets/textbox.h
index a3383208..d5695c0b 100644
--- a/include/widgets/textbox.h
+++ b/include/widgets/textbox.h
@@ -313,6 +313,7 @@ PangoAttrList *textbox_get_pango_attributes(textbox *tb);
  * @returns the visible text.
  */
 const char *textbox_get_visible_text(const textbox *tb);
+
 /**
  * @param wid The handle to the textbox.
  * @param height The height we want the desired width for
@@ -321,7 +322,7 @@ const char *textbox_get_visible_text(const textbox *tb);
  *
  * @returns the desired width of the textbox.
  */
-int textbox_get_desired_width(widget *wid, const int height);
+int textbox_get_desired_width(widget *wid, G_GNUC_UNUSED const int height);
 
 /**
  * @param tb  Handle to the textbox
diff --git a/include/widgets/widget-internal.h b/include/widgets/widget-internal.h
index f7b7c25f..8cc0a295 100644
--- a/include/widgets/widget-internal.h
+++ b/include/widgets/widget-internal.h
@@ -32,23 +32,22 @@
 
 /** Macro for initializing the RofiDistance struct. */
 #define WIDGET_DISTANCE_INIT                                                   \
-  (RofiDistance){                                                              \
-    .base = {                                                                  \
-      .distance = 0,                                                           \
-      .type = ROFI_PU_PX,                                                      \
-      .modtype = ROFI_DISTANCE_MODIFIER_NONE,                                  \
-      .left = NULL,                                                            \
-      .right = NULL,                                                           \
-    },                                                                         \
+  (RofiDistance) {                                                             \
+    .base =                                                                    \
+        {                                                                      \
+            .distance = 0,                                                     \
+            .type = ROFI_PU_PX,                                                \
+            .modtype = ROFI_DISTANCE_MODIFIER_NONE,                            \
+            .left = NULL,                                                      \
+            .right = NULL,                                                     \
+        },                                                                     \
     .style = ROFI_HL_SOLID,                                                    \
   }
-/* Macro for initializing the RofiPadding struct. */
+/** Macro for initializing the RofiPadding struct. */
 #define WIDGET_PADDING_INIT                                                    \
-  (RofiPadding){                                                               \
-    .top = WIDGET_DISTANCE_INIT,                                               \
-    .right = WIDGET_DISTANCE_INIT,                                             \
-    .bottom = WIDGET_DISTANCE_INIT,                                            \
-    .left = WIDGET_DISTANCE_INIT,                                              \
+  (RofiPadding) {                                                              \
+    .top = WIDGET_DISTANCE_INIT, .right = WIDGET_DISTANCE_INIT,                \
+    .bottom = WIDGET_DISTANCE_INIT, .left = WIDGET_DISTANCE_INIT,              \
   }
 
 /**
diff --git a/include/widgets/widget.h b/include/widgets/widget.h
index f41437b1..28edb33a 100644
--- a/include/widgets/widget.h
+++ b/include/widgets/widget.h
@@ -284,8 +284,10 @@ widget *widget_find_mouse_target(widget *wid, WidgetType type, gint x, gint y);
  *
  * @returns Whether the action would be handled or not
  */
-WidgetTriggerActionResult widget_check_action(widget *wid, guint action, gint x,
-                                              gint y);
+WidgetTriggerActionResult widget_check_action(widget *wid,
+                                              G_GNUC_UNUSED guint action,
+                                              G_GNUC_UNUSED gint x,
+                                              G_GNUC_UNUSED gint y);
 
 /**
  * @param wid The widget handle
diff --git a/include/xcb.h b/include/xcb.h
index f681eaae..4f67b9f3 100644
--- a/include/xcb.h
+++ b/include/xcb.h
@@ -44,6 +44,11 @@ typedef struct _xcb_stuff xcb_stuff;
  */
 extern xcb_stuff *xcb;
 
+/**
+ * @param data String to copy to clipboard.
+ *
+ * copies string to clipboard.
+ */
 void xcb_stuff_set_clipboard(char *data);
 
 /**
diff --git a/source/modes/dmenu.c b/source/modes/dmenu.c
index ee5e9288..e6245013 100644
--- a/source/modes/dmenu.c
+++ b/source/modes/dmenu.c
@@ -114,6 +114,8 @@ typedef struct {
   char *ballot_unselected;
 } DmenuModePrivateData;
 
+/** Maximum number of lines rofi parses async before it pushes it to the main
+ * thread. */
 #define BLOCK_LINES_SIZE 2048
 typedef struct {
   unsigned int length;
diff --git a/source/modes/script.c b/source/modes/script.c
index 5a705c36..5e2131de 100644
--- a/source/modes/script.c
+++ b/source/modes/script.c
@@ -463,12 +463,19 @@ static cairo_surface_t *script_get_icon(const Mode *sw,
 
 #include "mode-private.h"
 
+/** Structure that holds a user script
+ * found in $config/rofi/scripts/
+ */
 typedef struct ScriptUser {
+  /** name of the script */
   char *name;
+  /** path to the script. */
   char *path;
 } ScriptUser;
 
+/** list of user_scripts. */
 ScriptUser *user_scripts = NULL;
+/** number of user scripts collected */
 size_t num_scripts = 0;
 
 void script_mode_cleanup(void) {
@@ -538,10 +545,10 @@ Mode *script_mode_parse_setup(const char *str) {
   unsigned int index = 0;
   const char *const sep = ":";
   char **tokens = g_strsplit(str, sep, 2);
-  if ( tokens ){
+  if (tokens) {
     index = g_strv_length(tokens);
     sw->name = g_strdup(tokens[0]);
-    sw->ed = (void*)rofi_expand_path(tokens[1]);
+    sw->ed = (void *)rofi_expand_path(tokens[1]);
     g_strfreev(tokens);
   }
   if (index == 2) {
diff --git a/source/rofi.c b/source/rofi.c
index d8d6a1f1..e57ae721 100644
--- a/source/rofi.c
+++ b/source/rofi.c
@@ -85,6 +85,7 @@ const char *cache_dir = NULL;
 
 /** List of error messages.*/
 GList *list_of_error_msgs = NULL;
+/** List of warning messages for the user.*/
 GList *list_of_warning_msgs = NULL;
 
 static void rofi_collectmodes_destroy(void);
diff --git a/source/theme.c b/source/theme.c
index 774298c0..386a5ad6 100644
--- a/source/theme.c
+++ b/source/theme.c
@@ -46,13 +46,22 @@
 #include "widgets/textbox.h"
 #include <gio/gio.h>
 
+/**
+ * list of config files we parsed.
+ */
 GList *parsed_config_files = NULL;
 
+/** cleanup (free) the list of parsed config files. */
 void rofi_theme_free_parsed_files(void) {
   g_list_free_full(parsed_config_files, g_free);
   parsed_config_files = NULL;
 }
 
+/**
+ * @param is_term if print to terminal
+ *
+ * print the list of parsed config files.
+ */
 void rofi_theme_print_parsed_files(gboolean is_term) {
   printf("\nParsed files:\n");
   for (GList *iter = g_list_first(parsed_config_files); iter != NULL;
diff --git a/source/view.c b/source/view.c
index 491c1404..4378db96 100644
--- a/source/view.c
+++ b/source/view.c
@@ -130,9 +130,13 @@ struct {
   guint idle_timeout;
   /** timeout for reloading */
   guint refilter_timeout;
+  /** amount of time refiltering delay got reset */
   guint refilter_timeout_count;
 
+  /** if filtering takes longer then this time,
+   * reduce the amount of refilters. */
   double max_refilter_time;
+  /** enable the reduced refilter mode. */
   gboolean delayed_mode;
   /** timeout handling */
   guint user_timeout;
diff --git a/source/xcb.c b/source/xcb.c
index 6c8515cb..bcc4522f 100644
--- a/source/xcb.c
+++ b/source/xcb.c
@@ -992,8 +992,9 @@ static int monitor_active_from_id(int mon_id, workarea *mon) {
 
 // determine which monitor holds the active window, or failing that the mouse
 // pointer
-
+/** The cached monitor setup (mon_cache) is populated */
 gboolean mon_set = FALSE;
+/** cached monitor cache, to avoid multiple roundtrips to fetch this. */
 workarea mon_cache = {
     0,
 };