diff --git a/paddle/fluid/framework/version.h b/paddle/fluid/framework/version.h
index bf07fc288d827ee560c54ef3edc7cd39c9594d95..3a1a492701b56d75c123a231844ccbbacc1d611c 100644
--- a/paddle/fluid/framework/version.h
+++ b/paddle/fluid/framework/version.h
@@ -19,6 +19,11 @@ limitations under the License. */
 namespace paddle {
 namespace framework {
 
+// Note:
+// Program and Tensor that pass the IsXXXVersionSupported should
+// be supported by the current codes. Otherwise, it's a compatibility
+// bug.
+
 // The program version the current codes generate.
 constexpr int64_t kCurProgramVersion = 0;
 
@@ -27,8 +32,11 @@ constexpr int64_t kCurProgramVersion = 0;
 constexpr int64_t kSupportedProgramVersion[] = {0};
 
 // Due to historical reasons, tensor version use uint32_t.
+// The tensor version the current codes generate.
 constexpr uint32_t kCurTensorVersion = 0;
 
+// The tensor version that was generated by previous or current codes
+// and supported by current codes.
 constexpr uint32_t kSupportedTensorVersion[] = {0};
 
 bool IsProgramVersionSupported(int64_t version);
diff --git a/python/paddle/fluid/io.py b/python/paddle/fluid/io.py
index 3e02e14167331f15aeb4ffa1845ba756b4f42b77..656fafa0cb54d70e0eba8ec2bef21488c50d8d94 100644
--- a/python/paddle/fluid/io.py
+++ b/python/paddle/fluid/io.py
@@ -750,7 +750,6 @@ def load_inference_model(dirname,
         program_desc_str = f.read()
 
     program = Program.parse_from_string(program_desc_str)
-    # TODO(panyx0718): Link to our version and compatibility guide.
     if not core._is_program_version_supported(program._version()):
         raise ValueError("Unsupported program version: %d\n" %
                          program._version())