diff --git a/calibredb-core.el b/calibredb-core.el
index 9798ea2..2a9df9b 100644
--- a/calibredb-core.el
+++ b/calibredb-core.el
@@ -52,7 +52,7 @@
 
 
 (defgroup calibredb nil
-  "calibredb group"
+  "Calibredb group."
   :group 'calibredb)
 
 (defcustom calibredb-db-dir nil
diff --git a/calibredb-search.el b/calibredb-search.el
index 1ac0da0..76f9b96 100644
--- a/calibredb-search.el
+++ b/calibredb-search.el
@@ -781,8 +781,7 @@ ebook record will be shown.
   (calibredb-search-update-buffer))
 
 (defun calibredb-search-update-buffer (&optional page)
-  "Update the calibredb-search buffer listing to match the database.
-When FORCE is non-nil, redraw even when the database hasn't changed."
+  "Update the calibredb-search buffer listing to match the database with PAGE."
   (interactive)
   (with-current-buffer (calibredb-search-buffer)
     (let* ((inhibit-read-only t)
@@ -810,6 +809,7 @@ When FORCE is non-nil, redraw even when the database hasn't changed."
       entries)))
 
 (defun calibredb-search-more-data (page)
+  "Render candidates with PAGE."
   (let ((inhibit-read-only t))
     (setq calibredb-search-current-page page)
     (beginning-of-line)
@@ -818,6 +818,7 @@ When FORCE is non-nil, redraw even when the database hasn't changed."
 
 
 (defun calibredb-search-next-page ()
+  "Render next calibredb page."
   (interactive)
   (if (< calibredb-search-current-page calibredb-search-pages)
       (progn
@@ -826,6 +827,7 @@ When FORCE is non-nil, redraw even when the database hasn't changed."
     (message "Last page.")))
 
 (defun calibredb-search-previous-page ()
+  "Render previous calibredb page."
   (interactive)
   (if (> calibredb-search-current-page 1)
       (progn
diff --git a/calibredb-utils.el b/calibredb-utils.el
index 9a2829f..ca97139 100644
--- a/calibredb-utils.el
+++ b/calibredb-utils.el
@@ -845,7 +845,7 @@ Argument TITLE prompts to input the title.
 Optional argument ISBN prompts to input the isbn."
   (let* ((fetch-cover (cond ((string= calibredb-fetch-covers "yes") t)
                             ((string= calibredb-fetch-covers "no") nil)
-                            (t (yes-or-no-p "Fetch cover?: "))))
+                            (t (yes-or-no-p "Fetch cover? "))))
          (results (calibredb-fetch-metadata-from-sources author title ids isbn fetch-cover)))
     (cond (results
            (when fetch-cover (calibredb-select-and-set-cover))
@@ -947,7 +947,8 @@ With universal ARG \\[universal-argument] use title as initial value."
 
 ;; convert ebooks
 (defmacro calibredb-convert (type)
-  "Macro of function calibredb-convert-to-TYPE."
+  "Macro of function calibredb-convert-to-TYPE.
+Argument TYPE ebook type."
   `(defun ,(intern (format "calibredb-convert-to-%s" type)) (&optional candidate)
     ,(format "TODO: Convert the slected CANDIDATE to %s." type)
     (interactive)
@@ -1046,7 +1047,8 @@ With universal ARG \\[universal-argument] use title as initial value."
       )))
 
 (defmacro calibredb-all (field)
-  "Macro of function calibredb-all-FIELD."
+  "Macro of function calibredb-all-FIELD.
+Argument FIELD table name in database."
   `(defun ,(intern (format "calibredb-all-%s" field)) ()
      ,(format "Get all %s and return as a list." field)
      (seq-uniq