diff --git a/CHANGELOG b/CHANGELOG
index 31d3cf2f3..e1893ac44 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -29,9 +29,8 @@
 
 * Pending changes since 16.1.3
 ** Enhancements
-- ~ext:run-program~: when gray stream supplied as one of stream arguments
-  function will issue a warning and create new stream for the process
-  (instead of signalling a condition)
+- ~ext:run-program~: process streams may be virtual streams (for instance
+  ~*standard-output*~ in slime, or a string-output-stream)
 - ~ext:run-program~: environ argument defaults to ~:default~, when NIL
   passed empty environment is used
 - compiler: when gcc fails ecl prints the failing command output
diff --git a/src/doc/new-doc/extensions/osi.txi b/src/doc/new-doc/extensions/osi.txi
index 4b055bfa6..9bb1d5f99 100644
--- a/src/doc/new-doc/extensions/osi.txi
+++ b/src/doc/new-doc/extensions/osi.txi
@@ -220,10 +220,10 @@ Either @code{t}, @code{nil}, a pathname, a string, a stream or
 @code{:stream}. If @code{t} the standard input for the current process
 is inherited. If @code{nil}, @code{/dev/null} is used. If a pathname
 (or a string), the file so specified is used. If a stream, all the
-input is read from that stream and sent to the subprocess - stream
-must be ANSI stream (no in-memory virtual streams). If @code{:stream},
-the @code{external-process-input} slot is filled in with a stream that
-sends its output to the process. Defaults to @code{:stream}.
+input is read from that stream and sent to the subprocess. If
+@code{:stream}, the @code{external-process-input} slot is filled in
+with a stream that sends its output to the process. Defaults to
+@code{:stream}.
 @end defvr
 
 @defvr argument if-input-does-not-exist
@@ -237,10 +237,10 @@ Either @code{t}, @code{nil}, a pathname, a string, a stream, or
 @code{:stream}. If @code{t}, the standard output for the current
 process is inherited. If @code{nil}, @code{/dev/null} is used. If a
 pathname (or as string), the file so specified is used. If a stream,
-all the output from the process is written to this stream - stream
-must be ANSI stream (no in-memory virtual streams). If @code{:stream},
-the @code{external-process-output} slot is filled in with a stream
-that can be read to get the output. Defaults to @code{stream}.
+all the output from the process is written to this stream. If
+@code{:stream}, the @code{external-process-output} slot is filled in
+with a stream that can be read to get the output. Defaults to
+@code{:stream}.
 @end defvr
 
 @defvr argument if-output-exists