diff --git a/godoc/cmdline.go b/godoc/cmdline.go
index 7b7d7ba9..d0396a04 100644
--- a/godoc/cmdline.go
+++ b/godoc/cmdline.go
@@ -4,11 +4,9 @@
 package godoc
 
 import (
-	"bytes"
 	"fmt"
 	"go/ast"
 	"go/build"
-	"go/printer"
 	"io"
 	"log"
 	"os"
@@ -106,7 +104,8 @@ func CommandLine(w io.Writer, fs vfs.NameSpace, pres *Presentation, args []strin
 
 	// If we have more than one argument, use the remaining arguments for filtering.
 	if len(args) > 1 {
-		filterInfo(pres, args[1:], info)
+		info.IsFiltered = true
+		filterInfo(args[1:], info)
 	}
 
 	packageText := pres.PackageText
@@ -145,7 +144,9 @@ func paths(fs vfs.NameSpace, pres *Presentation, path string) (string, string) {
 	return pathpkg.Join(pres.PkgFSRoot(), path), path
 }
 
-func filterInfo(pres *Presentation, args []string, info *PageInfo) {
+// filterInfo updates info to include only the nodes that match the given
+// filter args.
+func filterInfo(args []string, info *PageInfo) {
 	rx, err := makeRx(args)
 	if err != nil {
 		log.Fatalf("illegal regular expression from %v: %v", args, err)
@@ -154,29 +155,21 @@ func filterInfo(pres *Presentation, args []string, info *PageInfo) {
 	filter := func(s string) bool { return rx.MatchString(s) }
 	switch {
 	case info.PAst != nil:
-		cmap := ast.NewCommentMap(info.FSet, info.PAst, info.PAst.Comments)
-		ast.FilterFile(info.PAst, filter)
-		// Special case: Don't use templates for printing
-		// so we only get the filtered declarations without
-		// package clause or extra whitespace.
-		for i, d := range info.PAst.Decls {
-			// determine the comments associated with d only
-			comments := cmap.Filter(d).Comments()
-			cn := &printer.CommentedNode{Node: d, Comments: comments}
-			if i > 0 {
-				fmt.Println()
+		newPAst := map[string]*ast.File{}
+		for name, a := range info.PAst {
+			cmap := ast.NewCommentMap(info.FSet, a, a.Comments)
+			a.Comments = []*ast.CommentGroup{} // remove all comments.
+			ast.FilterFile(a, filter)
+			if len(a.Decls) > 0 {
+				newPAst[name] = a
 			}
-			if pres.HTMLMode {
-				var buf bytes.Buffer
-				pres.WriteNode(&buf, info.FSet, cn)
-				FormatText(os.Stdout, buf.Bytes(), -1, true, "", nil)
-			} else {
-				pres.WriteNode(os.Stdout, info.FSet, cn)
+			for _, d := range a.Decls {
+				// add back the comments associated with d only
+				comments := cmap.Filter(d).Comments()
+				a.Comments = append(a.Comments, comments...)
 			}
-			fmt.Println()
 		}
-		return
-
+		info.PAst = newPAst // add only matching files.
 	case info.PDoc != nil:
 		info.PDoc.Filter(filter)
 	}
diff --git a/godoc/cmdline_test.go b/godoc/cmdline_test.go
index 303aeafc..52c706d2 100644
--- a/godoc/cmdline_test.go
+++ b/godoc/cmdline_test.go
@@ -157,6 +157,17 @@ func TestCommandLine(t *testing.T) {
 	mfs := mapfs.New(map[string]string{
 		"src/pkg/bar/bar.go": `// Package bar is an example.
 package bar
+`,
+		"src/pkg/foo/foo.go": `// Package foo.
+package foo
+
+// First function is first.
+func First() {
+}
+
+// Second function is second.
+func Second() {
+}
 `,
 		"src/cmd/go/doc.go": `// The go command
 package main
@@ -172,7 +183,10 @@ package main
 	p.cmdHandler = handlerServer{p, c, "/cmd/", "/src/cmd"}
 	p.pkgHandler = handlerServer{p, c, "/pkg/", "/src/pkg"}
 	p.initFuncMap()
-	p.PackageText = template.Must(template.New("PackageText").Funcs(p.FuncMap()).Parse(`{{with .PAst}}{{node $ .}}{{end}}{{with .PDoc}}{{if $.IsMain}}COMMAND {{.Doc}}{{else}}PACKAGE {{.Doc}}{{end}}{{end}}`))
+	p.PackageText = template.Must(template.New("PackageText").Funcs(p.FuncMap()).Parse(`{{with .PAst}}{{range $filename, $ast := .}}{{$filename}}:
+{{node $ $ast}}{{end}}{{end}}{{with .PDoc}}{{if $.IsMain}}COMMAND {{.Doc}}{{else}}PACKAGE {{.Doc}}{{end}}{{with .Funcs}}
+{{range .}}{{node $ .Decl}}
+{{comment_text .Doc "    " "\t"}}{{end}}{{end}}{{end}}`))
 
 	for _, tc := range []struct {
 		desc string
@@ -190,10 +204,20 @@ package main
 			args: []string{"bar"},
 			exp:  "PACKAGE Package bar is an example.\n",
 		},
+		{
+			desc: "package w. filter",
+			args: []string{"foo", "First"},
+			exp:  "PACKAGE \nfunc First()\n    First function is first.\n",
+		},
 		{
 			desc: "source mode",
 			args: []string{"src/bar"},
-			exp:  "// Package bar is an example.\npackage bar\n",
+			exp:  "bar/bar.go:\n// Package bar is an example.\npackage bar\n",
+		},
+		{
+			desc: "source mode w. filter",
+			args: []string{"src/foo", "Second"},
+			exp:  "// Second function is second.\nfunc Second() {\n}",
 		},
 		{
 			desc: "command",
diff --git a/godoc/godoc.go b/godoc/godoc.go
index cfa8c2f3..7964b524 100644
--- a/godoc/godoc.go
+++ b/godoc/godoc.go
@@ -219,12 +219,13 @@ type PageInfo struct {
 	Err     error  // error or nil
 
 	// package info
-	FSet     *token.FileSet         // nil if no package documentation
-	PDoc     *doc.Package           // nil if no package documentation
-	Examples []*doc.Example         // nil if no example code
-	Notes    map[string][]*doc.Note // nil if no package Notes
-	PAst     *ast.File              // nil if no AST with package exports
-	IsMain   bool                   // true for package main
+	FSet       *token.FileSet         // nil if no package documentation
+	PDoc       *doc.Package           // nil if no package documentation
+	Examples   []*doc.Example         // nil if no example code
+	Notes      map[string][]*doc.Note // nil if no package Notes
+	PAst       map[string]*ast.File   // nil if no AST with package exports
+	IsMain     bool                   // true for package main
+	IsFiltered bool                   // true if results were filtered
 
 	// directory info
 	Dirs    *DirList  // nil if no directory information
diff --git a/godoc/parser.go b/godoc/parser.go
index a27d4fdc..4762bef2 100644
--- a/godoc/parser.go
+++ b/godoc/parser.go
@@ -24,7 +24,7 @@ func (c *Corpus) parseFile(fset *token.FileSet, filename string, mode parser.Mod
 	return parser.ParseFile(fset, filename, src, mode)
 }
 
-func (c *Corpus) parseFiles(fset *token.FileSet, abspath string, localnames []string) (map[string]*ast.File, error) {
+func (c *Corpus) parseFiles(fset *token.FileSet, relpath string, abspath string, localnames []string) (map[string]*ast.File, error) {
 	files := make(map[string]*ast.File)
 	for _, f := range localnames {
 		absname := pathpkg.Join(abspath, f)
@@ -32,7 +32,7 @@ func (c *Corpus) parseFiles(fset *token.FileSet, abspath string, localnames []st
 		if err != nil {
 			return nil, err
 		}
-		files[absname] = file
+		files[pathpkg.Join(relpath, f)] = file
 	}
 
 	return files, nil
diff --git a/godoc/server.go b/godoc/server.go
index f152adc3..33467304 100644
--- a/godoc/server.go
+++ b/godoc/server.go
@@ -97,7 +97,7 @@ func (h *handlerServer) GetPageInfo(abspath, relpath string, mode PageInfoMode)
 	if len(pkgfiles) > 0 {
 		// build package AST
 		fset := token.NewFileSet()
-		files, err := h.c.parseFiles(fset, abspath, pkgfiles)
+		files, err := h.c.parseFiles(fset, relpath, abspath, pkgfiles)
 		if err != nil {
 			info.Err = err
 			return info
@@ -128,7 +128,7 @@ func (h *handlerServer) GetPageInfo(abspath, relpath string, mode PageInfoMode)
 
 			// collect examples
 			testfiles := append(pkginfo.TestGoFiles, pkginfo.XTestGoFiles...)
-			files, err = h.c.parseFiles(fset, abspath, testfiles)
+			files, err = h.c.parseFiles(fset, relpath, abspath, testfiles)
 			if err != nil {
 				log.Println("parsing examples:", err)
 			}
@@ -156,7 +156,7 @@ func (h *handlerServer) GetPageInfo(abspath, relpath string, mode PageInfoMode)
 			if mode&NoFiltering == 0 {
 				packageExports(fset, pkg)
 			}
-			info.PAst = ast.MergePackageFiles(pkg, 0)
+			info.PAst = files
 		}
 		info.IsMain = pkgname == "main"
 	}
@@ -218,7 +218,10 @@ func (h *handlerServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	var tabtitle, title, subtitle string
 	switch {
 	case info.PAst != nil:
-		tabtitle = info.PAst.Name.Name
+		for _, ast := range info.PAst {
+			tabtitle = ast.Name.Name
+			break
+		}
 	case info.PDoc != nil:
 		tabtitle = info.PDoc.Name
 	default:
diff --git a/godoc/static/package.txt b/godoc/static/package.txt
index d191621c..44ab380e 100644
--- a/godoc/static/package.txt
+++ b/godoc/static/package.txt
@@ -1,51 +1,56 @@
-{{with .PAst}}{{node $ .}}{{end}}{{/*
+{{$info := .}}{{$filtered := .IsFiltered}}{{/*
+
+---------------------------------------
+
+*/}}{{if $filtered}}{{range .PAst}}{{range .Decls}}{{node $info .}}{{end}}{{end}}{{else}}{{with .PAst}}{{range $filename, $ast := .}}{{$filename}}:
+{{node $ $ast}}{{end}}{{end}}{{end}}{{/*
 
 ---------------------------------------
 
 */}}{{with .PDoc}}{{if $.IsMain}}COMMAND DOCUMENTATION
 
 {{comment_text .Doc "    " "\t"}}
-{{else}}PACKAGE DOCUMENTATION
+{{else}}{{if not $filtered}}PACKAGE DOCUMENTATION
 
 package {{.Name}}
     import "{{.ImportPath}}"
 
 {{comment_text .Doc "    " "\t"}}
-{{example_text $ "" "    "}}{{/*
+{{example_text $ "" "    "}}{{end}}{{/*
 
 ---------------------------------------
 
-*/}}{{with .Consts}}
+*/}}{{with .Consts}}{{if not $filtered}}
 CONSTANTS
 
-{{range .}}{{node $ .Decl}}
+{{end}}{{range .}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
 {{end}}{{end}}{{/*
 
 ---------------------------------------
 
-*/}}{{with .Vars}}
+*/}}{{with .Vars}}{{if not $filtered}}
 VARIABLES
 
-{{range .}}{{node $ .Decl}}
+{{end}}{{range .}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
 {{end}}{{end}}{{/*
 
 ---------------------------------------
 
-*/}}{{with .Funcs}}
+*/}}{{with .Funcs}}{{if not $filtered}}
 FUNCTIONS
 
-{{range .}}{{node $ .Decl}}
+{{end}}{{range .}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
 {{example_text $ .Name "    "}}{{end}}{{end}}{{/*
 
 ---------------------------------------
 
-*/}}{{with .Types}}
+*/}}{{with .Types}}{{if not $filtered}}
 TYPES
 
-{{range .}}{{$tname := .Name}}{{node $ .Decl}}
+{{end}}{{range .}}{{$tname := .Name}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
 {{range .Consts}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
diff --git a/godoc/static/static.go b/godoc/static/static.go
index ad409d3f..21cb1d79 100644
--- a/godoc/static/static.go
+++ b/godoc/static/static.go
@@ -751,54 +751,59 @@ $(document).ready(function() {
 	{{end}}
 {{end}}
 `,
-	"package.txt": `{{with .PAst}}{{node $ .}}{{end}}{{/*
+	"package.txt": `{{$info := .}}{{$filtered := .IsFiltered}}{{/*
+
+---------------------------------------
+
+*/}}{{if $filtered}}{{range .PAst}}{{range .Decls}}{{node $info .}}{{end}}{{end}}{{else}}{{with .PAst}}{{range $filename, $ast := .}}{{$filename}}:
+{{node $ $ast}}{{end}}{{end}}{{end}}{{/*
 
 ---------------------------------------
 
 */}}{{with .PDoc}}{{if $.IsMain}}COMMAND DOCUMENTATION
 
 {{comment_text .Doc "    " "\t"}}
-{{else}}PACKAGE DOCUMENTATION
+{{else}}{{if not $filtered}}PACKAGE DOCUMENTATION
 
 package {{.Name}}
     import "{{.ImportPath}}"
 
 {{comment_text .Doc "    " "\t"}}
-{{example_text $ "" "    "}}{{/*
+{{example_text $ "" "    "}}{{end}}{{/*
 
 ---------------------------------------
 
-*/}}{{with .Consts}}
+*/}}{{with .Consts}}{{if not $filtered}}
 CONSTANTS
 
-{{range .}}{{node $ .Decl}}
+{{end}}{{range .}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
 {{end}}{{end}}{{/*
 
 ---------------------------------------
 
-*/}}{{with .Vars}}
+*/}}{{with .Vars}}{{if not $filtered}}
 VARIABLES
 
-{{range .}}{{node $ .Decl}}
+{{end}}{{range .}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
 {{end}}{{end}}{{/*
 
 ---------------------------------------
 
-*/}}{{with .Funcs}}
+*/}}{{with .Funcs}}{{if not $filtered}}
 FUNCTIONS
 
-{{range .}}{{node $ .Decl}}
+{{end}}{{range .}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
 {{example_text $ .Name "    "}}{{end}}{{end}}{{/*
 
 ---------------------------------------
 
-*/}}{{with .Types}}
+*/}}{{with .Types}}{{if not $filtered}}
 TYPES
 
-{{range .}}{{$tname := .Name}}{{node $ .Decl}}
+{{end}}{{range .}}{{$tname := .Name}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}
 {{range .Consts}}{{node $ .Decl}}
 {{comment_text .Doc "    " "\t"}}