diff --git a/lisp/progmodes/eglot.el b/lisp/progmodes/eglot.el
index 10b6c0cc2ca..a4f859745e7 100644
--- a/lisp/progmodes/eglot.el
+++ b/lisp/progmodes/eglot.el
@@ -3128,14 +3128,12 @@ for which LSP on-type-formatting should be requested."
           (setq params-start (match-beginning 2) params-end (match-end 2))
           (add-face-text-property (match-beginning 1) (match-end 1)
                                   'font-lock-function-name-face))
-        ;; Decide whether to add one-line-summary to signature line
-        (when (and (stringp documentation)
-                   (string-match "[[:space:]]*\\([^.\r\n]+[.]?\\)"
-                                 documentation))
-          (setq documentation (match-string 1 documentation))
-          (unless (string-prefix-p (string-trim documentation) label)
-            (goto-char (point-max))
-            (insert ": " (eglot--format-markup documentation))))
+        ;; Insert documentation
+        (goto-char (point-max))
+        (unless (null documentation)
+          (insert ": " (if (stringp documentation)
+                         documentation
+                         (eglot--format-markup documentation))))
         ;; Decide what to do with the active parameter...
         (when (and active-param (< -1 active-param (length parameters)))
           (eglot--dbind ((ParameterInformation) label documentation)