diff --git a/src/CHANGELOG b/src/CHANGELOG
index ced663cc6..213bed068 100644
--- a/src/CHANGELOG
+++ b/src/CHANGELOG
@@ -10,6 +10,9 @@ ECL 1.0:
  - New commands, :RESTART, :R1, :R2, etc, allow invoking restarts (contributed
    by Chui Tey).
 
+ - Interpreted functions can now be disassembled in the debugger. The commands
+   are :D and :DISASSEMBLE.
+
 * Bugs fixed:
 
  - STREAMP signals an error for Gray streams.
diff --git a/src/lsp/top.lsp b/src/lsp/top.lsp
index 624a62021..0425d5f23 100644
--- a/src/lsp/top.lsp
+++ b/src/lsp/top.lsp
@@ -188,7 +188,7 @@ rebinds this variable to NIL when control enters a break loop.")
  	function, its lexical environment is available for inspection and~@
 	becomes the environment for evaluating user input forms.~@
 	~@
-	See also: :backtrace, :next, previous, :variables.~%")
+	See also: :backtrace, :next, previous, :disassemble, :variables.~%")
       ((:p :previous) tpl-previous nil
        ":p(revious)	Go to previous function"
        ":previous &optional (n 1)			[Break command]~@
@@ -232,6 +232,13 @@ rebinds this variable to NIL when control enters a break loop.")
 	The match is case insensitive.~@
 	~@
 	See also: :backtrace, :function, :previous.~%")
+      ((:d :disassemble) tpl-disassemble-command nil
+       ":d(isassemble)	Disassemble current function"
+       ":disassemble					[Break command]~@
+	:d						[Abbreviation]~@
+	~@
+	Disassemble the current function. Currently, only interpreted functions~@
+	can be disassembled.~%")
       ((:v :variables) tpl-variables-command nil
        ":v(ariables)	Show local variables, functions, blocks, and tags"
        ":variables &optional no-values			[Break command]~@
@@ -534,6 +541,17 @@ under certain conditions; see file 'Copyright' for details.")
     (terpri))
   (values))
 
+(defun tpl-disassemble-command (&optional no-values)
+  (let*((*print-level* 2)
+	(*print-length* 4)
+	(*print-pretty* t)
+	(*print-readably* nil)
+	(functions) (blocks) (variables))
+    (unless (si::bc-disassemble (ihs-fun *ihs-current*))
+      (tpl-print-current)
+      (format t " Function cannot be disassembled.~%"))
+    (values)))
+
 (defun tpl-variables-command (&optional no-values)
   (let*((*print-level* 2)
 	(*print-length* 4)