diff --git a/testdata/godoc-v2.x.txt b/testdata/godoc-v2.x.txt
index 03b76f8..d85ecf3 100644
--- a/testdata/godoc-v2.x.txt
+++ b/testdata/godoc-v2.x.txt
@@ -754,6 +754,14 @@ type DocGenerationFlag interface {
     DocGenerationFlag is an interface that allows documentation generation for
     the flag
 
+type DocGenerationSliceFlag interface {
+	DocGenerationFlag
+
+	// IsSliceFlag returns true for flags that can be given multiple times.
+	IsSliceFlag() bool
+}
+    DocGenerationSliceFlag extends DocGenerationFlag for slice-based flags.
+
 type DurationFlag struct {
 	Name string
 
@@ -1077,6 +1085,9 @@ func (f *Float64SliceFlag) IsRequired() bool
 func (f *Float64SliceFlag) IsSet() bool
     IsSet returns whether or not the flag has been set through env or file
 
+func (f *Float64SliceFlag) IsSliceFlag() bool
+    IsSliceFlag implements DocGenerationSliceFlag.
+
 func (f *Float64SliceFlag) IsVisible() bool
     IsVisible returns true if the flag is not hidden, otherwise false
 
@@ -1312,6 +1323,9 @@ func (f *Int64SliceFlag) IsRequired() bool
 func (f *Int64SliceFlag) IsSet() bool
     IsSet returns whether or not the flag has been set through env or file
 
+func (f *Int64SliceFlag) IsSliceFlag() bool
+    IsSliceFlag implements DocGenerationSliceFlag.
+
 func (f *Int64SliceFlag) IsVisible() bool
     IsVisible returns true if the flag is not hidden, otherwise false
 
@@ -1477,6 +1491,9 @@ func (f *IntSliceFlag) IsRequired() bool
 func (f *IntSliceFlag) IsSet() bool
     IsSet returns whether or not the flag has been set through env or file
 
+func (f *IntSliceFlag) IsSliceFlag() bool
+    IsSliceFlag implements DocGenerationSliceFlag.
+
 func (f *IntSliceFlag) IsVisible() bool
     IsVisible returns true if the flag is not hidden, otherwise false
 
@@ -1817,6 +1834,9 @@ func (f *StringSliceFlag) IsRequired() bool
 func (f *StringSliceFlag) IsSet() bool
     IsSet returns whether or not the flag has been set through env or file
 
+func (f *StringSliceFlag) IsSliceFlag() bool
+    IsSliceFlag implements DocGenerationSliceFlag.
+
 func (f *StringSliceFlag) IsVisible() bool
     IsVisible returns true if the flag is not hidden, otherwise false
 
@@ -2078,6 +2098,9 @@ func (f *Uint64SliceFlag) IsRequired() bool
 func (f *Uint64SliceFlag) IsSet() bool
     IsSet returns whether or not the flag has been set through env or file
 
+func (f *Uint64SliceFlag) IsSliceFlag() bool
+    IsSliceFlag implements DocGenerationSliceFlag.
+
 func (f *Uint64SliceFlag) IsVisible() bool
     IsVisible returns true if the flag is not hidden, otherwise false
 
@@ -2237,6 +2260,9 @@ func (f *UintSliceFlag) IsRequired() bool
 func (f *UintSliceFlag) IsSet() bool
     IsSet returns whether or not the flag has been set through env or file
 
+func (f *UintSliceFlag) IsSliceFlag() bool
+    IsSliceFlag implements DocGenerationSliceFlag.
+
 func (f *UintSliceFlag) IsVisible() bool
     IsVisible returns true if the flag is not hidden, otherwise false