diff --git a/README.org b/README.org
index f129f55..f931841 100644
--- a/README.org
+++ b/README.org
@@ -24,8 +24,7 @@ Both functions are accessed through Kagi's [[https://help.kagi.com/kagi/api/over
 ** FastGPT
 
 - =kagi-fastgpt-shell= :: Opens a shell buffer in a new window where prompts can be typed. This Kagi FastGPT typically returns output based on actual search results. When point is on one of the listed URLs, press =C-c RET= to open it.
-- =kagi-fastgpt-prompt= :: Enter a prompt in the minibuffer and show the result in a separate buffer. With a universal prefix (=C-u=), the result is inserted at point.
-- =kagi-fastgpt= :: Function to retrieve a FastGPT response, to be used from Lisp code.
+- =kagi-fastgpt-prompt= :: Enter a prompt in the minibuffer and show the result in a separate buffer. With a universal prefix (=C-u=), the result is inserted at point. This function can also be used from Lisp code.
 
 kagi.el has some functions that use FastGPT to perform certain operations on text:
 
@@ -205,6 +204,10 @@ Because the =fastgpt-shell-mode-map= only becomes available when =kagi-fastgpt-s
 
 ** 0.4pre
 
+*** Breaking changes
+
+- Obsoleted function =kagi-fastgpt= in favor of =kagi-fastgpt-prompt=. To be removed in a next release.
+
 *** New
 
 - Introduce variable =kagi-summarizer-default-summary-format=, to produce a paragraph summary (default) or a take-away in bullet-list format.
diff --git a/kagi.el b/kagi.el
index e5d4f80..457acb2 100644
--- a/kagi.el
+++ b/kagi.el
@@ -332,13 +332,22 @@ list of conses."
   (save-excursion
     (insert (substring-no-properties summary))))
 
-(defun kagi-fastgpt (prompt)
-  "Submit a PROMPT to FastGPT and return a formatted response string."
+(defun kagi--fastgpt (prompt)
+  "Submit a PROMPT to FastGPT and return a formatted response string.
+
+This is used by `kagi-fastgpt-shell' and `kagi-fastgpt-prompt' to
+obtain a result from FastGPT. Use the latter function for
+retrieving a result from Lisp code."
   (let* ((response (kagi--call-fastgpt prompt))
          (parsed-response (json-parse-string response))
          (output (kagi--gethash parsed-response "data" "output"))
          (references (kagi--gethash parsed-response "data" "references")))
-    (format "%s\n\n%s" (kagi--format-output output) (kagi--format-references references))))
+    (string-trim
+     (format "%s\n\n%s"
+             (kagi--format-output output)
+             (kagi--format-references references)))))
+
+(define-obsolete-function-alias 'kagi-fastgpt 'kagi-fastgpt-prompt "0.4")
 
 (defun kagi--fastgpt-display-result (result)
   "Display the RESULT of a FastGPT prompt in a new buffer."
@@ -356,7 +365,7 @@ list of conses."
    :execute-command
    (lambda (command _history callback error-callback)
      (condition-case err
-         (funcall callback (kagi-fastgpt command) nil)
+         (funcall callback (kagi--fastgpt command) nil)
        (json-parse-error (funcall error-callback
                                   (format "Could not parse the server response %s" (cdr err))))
        (error (funcall error-callback (format "An error occurred during the request %s" (cdr err)))))))
@@ -386,7 +395,7 @@ string (suitable for invocations from Emacs Lisp)."
   (interactive (list (read-string "fastgpt> ")
                      current-prefix-arg
                      t))
-  (let* ((result (string-trim (kagi-fastgpt prompt)))
+  (let* ((result (kagi--fastgpt prompt))
          (result-lines (length (string-lines result))))
     (cond ((and insert (not buffer-read-only))
            (save-excursion