diff --git a/api/ffi/src/lib.rs b/api/ffi/src/lib.rs
index de0f2b7560..9c57c0ed81 100644
--- a/api/ffi/src/lib.rs
+++ b/api/ffi/src/lib.rs
@@ -124,6 +124,14 @@ pub unsafe extern "C" fn tract_nnef_enable_tract_core(nnef: *mut TractNnef) -> T
     })
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn tract_nnef_enable_tract_extra(nnef: *mut TractNnef) -> TRACT_RESULT {
+    wrap(|| unsafe {
+        check_not_null!(nnef);
+        (*nnef).0.enable_tract_extra()
+    })
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn tract_nnef_enable_onnx(nnef: *mut TractNnef) -> TRACT_RESULT {
     wrap(|| unsafe {
diff --git a/api/generate-tract-h.sh b/api/generate-tract-h.sh
new file mode 100755
index 0000000000..3ce87536c5
--- /dev/null
+++ b/api/generate-tract-h.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -ex
+
+cbindgen ffi > tract,h
+cp tract.h c
+cp tract.h proxy/sys
diff --git a/api/proxy/src/lib.rs b/api/proxy/src/lib.rs
index c2da4459be..06e6f3b96e 100644
--- a/api/proxy/src/lib.rs
+++ b/api/proxy/src/lib.rs
@@ -69,6 +69,10 @@ impl NnefInterface for Nnef {
         check!(sys::tract_nnef_enable_tract_core(self.0))
     }
 
+    fn enable_tract_extra(&mut self) -> Result<()> {
+        check!(sys::tract_nnef_enable_tract_extra(self.0))
+    }
+
     fn enable_onnx(&mut self) -> Result<()> {
         check!(sys::tract_nnef_enable_onnx(self.0))
     }
diff --git a/api/proxy/sys/tract.h b/api/proxy/sys/tract.h
index b3c9254ff6..1471d65425 100644
--- a/api/proxy/sys/tract.h
+++ b/api/proxy/sys/tract.h
@@ -83,7 +83,7 @@ const char *tract_version(void);
 void tract_free_cstring(char *ptr);
 
 /**
- * Creates an instance of an NNEF framework and parser that can be used to load models.
+ * Creates an instance of an NNEF framework and parser that can be used to load and dump NNEF models.
  *
  * The returned object should be destroyed with `tract_nnef_destroy` once the model
  * has been loaded.
@@ -92,6 +92,8 @@ enum TRACT_RESULT tract_nnef_create(struct TractNnef **nnef);
 
 enum TRACT_RESULT tract_nnef_enable_tract_core(struct TractNnef *nnef);
 
+enum TRACT_RESULT tract_nnef_enable_tract_extra(struct TractNnef *nnef);
+
 enum TRACT_RESULT tract_nnef_enable_onnx(struct TractNnef *nnef);
 
 enum TRACT_RESULT tract_nnef_enable_pulse(struct TractNnef *nnef);
diff --git a/api/py/tests/mobilenet_onnx_test.py b/api/py/tests/mobilenet_onnx_test.py
index 4bd6d7b7b2..b3d5785bd5 100644
--- a/api/py/tests/mobilenet_onnx_test.py
+++ b/api/py/tests/mobilenet_onnx_test.py
@@ -48,7 +48,7 @@ def test_state():
     assert numpy.argmax(confidences) == 652
 
 def test_nnef_register():
-    tract.nnef().with_tract_core().with_onnx().with_pulse()
+    tract.nnef().with_tract_core().with_onnx().with_pulse().with_tract_extra()
 
 def test_nnef():
     model = (
diff --git a/api/py/tract/nnef.py b/api/py/tract/nnef.py
index 074895c3a7..e9d7634b78 100644
--- a/api/py/tract/nnef.py
+++ b/api/py/tract/nnef.py
@@ -56,6 +56,14 @@ def with_tract_core(self) -> "Nnef":
         check(lib.tract_nnef_enable_tract_core(self.ptr))
         return self
 
+    def with_tract_extra(self) -> "Nnef":
+        """
+        Enable tract-extra extensions to NNEF.
+        """
+        self._valid()
+        check(lib.tract_nnef_enable_tract_extra(self.ptr))
+        return self
+
     def with_onnx(self) -> "Nnef":
         """
         Enable tract-opl extensions to NNEF to covers (more or) ONNX operator set
diff --git a/api/rs/Cargo.toml b/api/rs/Cargo.toml
index 4cb1dd03d5..105921040b 100644
--- a/api/rs/Cargo.toml
+++ b/api/rs/Cargo.toml
@@ -22,6 +22,7 @@ tract-api = { path = ".." , version = "=0.20.19-pre" }
 tract-nnef = { path = "../../nnef/" , version = "=0.20.19-pre" }
 tract-onnx-opl = { path = "../../onnx-opl/" , version = "=0.20.19-pre" }
 tract-onnx = { path = "../../onnx/" , version = "=0.20.19-pre" }
+tract-extra = { path = "../../extra/" , version = "=0.20.19-pre" }
 tract-pulse = { path = "../../pulse/" , version = "=0.20.19-pre" }
 tract-libcli = { path = "../../libcli" , version = "=0.20.19-pre" }
 serde_json.workspace = true
diff --git a/api/rs/src/lib.rs b/api/rs/src/lib.rs
index ff68712c9e..87ea00c116 100644
--- a/api/rs/src/lib.rs
+++ b/api/rs/src/lib.rs
@@ -4,6 +4,7 @@ use std::sync::Arc;
 
 use anyhow::{Context, Result};
 use ndarray::{Data, Dimension, RawData};
+use tract_extra::WithTractExtra;
 use tract_libcli::annotations::Annotations;
 use tract_libcli::profile::BenchLimits;
 use tract_nnef::internal::parse_tdim;
@@ -46,6 +47,11 @@ impl NnefInterface for Nnef {
         Ok(())
     }
 
+    fn enable_tract_extra(&mut self) -> Result<()> {
+        self.0.enable_tract_extra();
+        Ok(())
+    }
+
     fn enable_onnx(&mut self) -> Result<()> {
         self.0.enable_onnx();
         Ok(())
diff --git a/api/src/lib.rs b/api/src/lib.rs
index 5e71771411..55dd5ec56b 100644
--- a/api/src/lib.rs
+++ b/api/src/lib.rs
@@ -19,6 +19,9 @@ pub trait NnefInterface: Sized {
     /// Allow the framework to use tract_core extensions instead of a stricter NNEF definition.
     fn enable_tract_core(&mut self) -> Result<()>;
 
+    /// Allow the framework to use tract_extra extensions.
+    fn enable_tract_extra(&mut self) -> Result<()>;
+
     /// Allow the framework to use tract_onnx extensions to support operators in ONNX that are
     /// absent from NNEF.
     fn enable_onnx(&mut self) -> Result<()>;
@@ -38,6 +41,12 @@ pub trait NnefInterface: Sized {
         Ok(self)
     }
 
+    /// Convenience function, similar with enable_tract_core but allowing method chaining.
+    fn with_tract_extra(mut self) -> Result<Self> {
+        self.enable_tract_extra()?;
+        Ok(self)
+    }
+
     /// Convenience function, similar with enable_onnx but allowing method chaining.
     fn with_onnx(mut self) -> Result<Self> {
         self.enable_onnx()?;
diff --git a/api/tract.h b/api/tract.h
index b3c9254ff6..1471d65425 100644
--- a/api/tract.h
+++ b/api/tract.h
@@ -83,7 +83,7 @@ const char *tract_version(void);
 void tract_free_cstring(char *ptr);
 
 /**
- * Creates an instance of an NNEF framework and parser that can be used to load models.
+ * Creates an instance of an NNEF framework and parser that can be used to load and dump NNEF models.
  *
  * The returned object should be destroyed with `tract_nnef_destroy` once the model
  * has been loaded.
@@ -92,6 +92,8 @@ enum TRACT_RESULT tract_nnef_create(struct TractNnef **nnef);
 
 enum TRACT_RESULT tract_nnef_enable_tract_core(struct TractNnef *nnef);
 
+enum TRACT_RESULT tract_nnef_enable_tract_extra(struct TractNnef *nnef);
+
 enum TRACT_RESULT tract_nnef_enable_onnx(struct TractNnef *nnef);
 
 enum TRACT_RESULT tract_nnef_enable_pulse(struct TractNnef *nnef);
diff --git a/cli/src/main.rs b/cli/src/main.rs
index 5a983055a7..507e57d6d7 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -613,8 +613,8 @@ fn nnef(matches: &clap::ArgMatches) -> tract_nnef::internal::Nnef {
     if matches.is_present("nnef-tract-extra") {
         #[cfg(feature = "extra")]
         {
-            use tract_extra::WithExtra;
-            fw = fw.with_extra();
+            use tract_extra::WithTractExtra;
+            fw = fw.with_tract_extra();
         }
         #[cfg(not(feature = "extra"))]
         {
diff --git a/extra/src/exp_unit_norm.rs b/extra/src/exp_unit_norm.rs
index 3a0945b8e2..981eb75261 100644
--- a/extra/src/exp_unit_norm.rs
+++ b/extra/src/exp_unit_norm.rs
@@ -70,7 +70,7 @@ impl EvalOp for ExpUnitNorm {
         _session: &mut SessionState,
         _node_id: usize,
     ) -> TractResult<Option<Box<dyn OpState>>> {
-        Ok(Some(Box::new(ExpUnitNormState::default())))
+        Ok(Some(Box::<ExpUnitNormState>::default()))
     }
 
     fn eval(&self, inputs: TVec<TValue>) -> TractResult<TVec<TValue>> {
@@ -93,7 +93,7 @@ impl ExpUnitNormState {
                     *s = x.max(op.epsilon) * (1f32 - op.alpha) + *s * op.alpha;
                 });
             }
-            time_slice.zip_mut_with(&state, |x, s| *x = *x / s.sqrt());
+            time_slice.zip_mut_with(&state, |x, s| *x /= s.sqrt());
             self.index += 1;
         }
         Ok(tvec!(input.into_tvalue()))
diff --git a/extra/src/lib.rs b/extra/src/lib.rs
index 9cad7ef951..dbe46874b3 100644
--- a/extra/src/lib.rs
+++ b/extra/src/lib.rs
@@ -2,29 +2,29 @@ use tract_nnef::internal::*;
 
 mod exp_unit_norm;
 
-pub trait WithExtra {
-    fn enable_extra(&mut self);
-    fn with_extra(self) -> Self;
+pub trait WithTractExtra {
+    fn enable_tract_extra(&mut self);
+    fn with_tract_extra(self) -> Self;
 }
 
-impl WithExtra for tract_nnef::framework::Nnef {
-    fn enable_extra(&mut self) {
+impl WithTractExtra for tract_nnef::framework::Nnef {
+    fn enable_tract_extra(&mut self) {
         self.enable_tract_core();
-        self.registries.push(tract_nnef_registry());
+        self.registries.push(tract_extra_registry());
     }
 
-    fn with_extra(mut self) -> Self {
-        self.enable_extra();
+    fn with_tract_extra(mut self) -> Self {
+        self.enable_tract_extra();
         self
     }
 }
 
-pub fn tract_nnef_registry() -> Registry {
+pub fn tract_extra_registry() -> Registry {
     let mut reg = Registry::new("tract_extra");
     exp_unit_norm::register(&mut reg);
     reg
 }
 
 pub fn register_pulsifiers() {
-    let _ = tract_nnef_registry();
+    let _ = tract_extra_registry();
 }