diff --git a/doc/design/if_else_op.md b/doc/design/if_else_op.md
index daba92248eaddcf620299bec488930c4997b6f46..7370c2a24fa644a64e738f202bac9b9209642e08 100644
--- a/doc/design/if_else_op.md
+++ b/doc/design/if_else_op.md
@@ -7,7 +7,7 @@ x = var()
 y = var()
 cond = var()
 
-b = pd.create_ifop_builder(inputs=[x], output_num=1)
+b = pd.create_ifop(inputs=[x], output_num=1)
 with b.true_block():
     x = b.inputs(0)
     z = operator.add(x, y)
@@ -25,7 +25,7 @@ x = var()
 y = var()
 cond = var()
 default_value = var()
-b = pd.create_ifelseop_builder(inputs=[x], output_num=1)
+b = pd.create_ifelseop(inputs=[x], output_num=1)
 with b.true_block():
     x = b.inputs(0)
     z = operator.add(x, y)
@@ -47,7 +47,7 @@ x = var()
 y = var()
 cond = var()
 default_value = var()
-b = pd.create_ifelseop_builder(inputs=[x], output_num=1, default_value)
+b = pd.create_ifelseop(inputs=[x], output_num=1, default_value)
 
 with b.true_block():
     x = b.inputs(0)