diff --git a/examples/fortran/lhapdf_example_v1.f90 b/examples/fortran/lhapdf_example_v1.f90
index f9acf3c5..677ab5e3 100644
--- a/examples/fortran/lhapdf_example_v1.f90
+++ b/examples/fortran/lhapdf_example_v1.f90
@@ -11,8 +11,8 @@ program lhapdf_example
     type(pineappl_kinematics) :: kinematics(3)
     type(pineappl_interp_tuples) :: interpolations(3)
 
-    type (pineappl_xfx) :: xfx(2)
-    type (pineappl_alphas) :: alphas
+    type(pineappl_xfx) :: xfx(2)
+    type(pineappl_alphas) :: alphas
 
     integer(kind(pineappl_reweight_meth)) :: q2_reweight
     integer(kind(pineappl_reweight_meth)) :: x_reweight
@@ -22,8 +22,8 @@ program lhapdf_example
 
     integer, target :: flags(2)
 
-    channels = pineappl_channel_new()
-    call pineappl_channel_add(channels, 3, 2, [0, 0, 1, -1, 2, -2], [1.0_dp, 1.0_dp, 1.0_dp])
+    channels = pineappl_channels_new()
+    call pineappl_channels_add(channels, 3, 2, [0, 0, 1, -1, 2, -2], [1.0_dp, 1.0_dp, 1.0_dp])
 
     kinematics = [&
         pineappl_kinematics(pineappl_scale, 0), &
@@ -42,7 +42,7 @@ program lhapdf_example
         pineappl_interp_tuples(2e-7, 1.0, 50, 3, x_reweight, x_mapping, interpolation_meth) &
     ]
 
-    grid = pineappl_grid_new2(pineappl_pdg, channels, 1, [2_1, 0_1, 0_1, 0_1], 2, &
+    grid = pineappl_grid_new2(pineappl_pdg, channels, 1, [2_1, 0_1, 0_1, 0_1, 0_1], 2, &
         [0.0_dp, 1.0_dp, 2.0_dp], 2, [pineappl_unpol_pdf, pineappl_unpol_pdf], [2212, 2212], kinematics, interpolations, [1, 1, 0])
 
     call pineappl_grid_fill_all2(grid, 0, 0.5_dp, [100.0_dp, 0.5_dp, 0.5_dp], [0.5_dp, 0.5_dp, 0.5_dp])
diff --git a/examples/fortran/pineappl.f90 b/examples/fortran/pineappl.f90
index a6856bd6..da2cc716 100644
--- a/examples/fortran/pineappl.f90
+++ b/examples/fortran/pineappl.f90
@@ -121,8 +121,8 @@ function strlen(s) bind(c, name="strlen")
             integer (c_size_t)  :: strlen
         end function strlen
 
-        subroutine channel_add(lumi, combinations, nb_combinations, pdg_id_combinations, factors) &
-            bind(c, name = 'pineappl_channel_add')
+        subroutine channels_add(lumi, combinations, nb_combinations, pdg_id_combinations, factors) &
+            bind(c, name = 'pineappl_channels_add')
             
             use iso_c_binding
             type (c_ptr), value       :: lumi
@@ -131,7 +131,7 @@ subroutine channel_add(lumi, combinations, nb_combinations, pdg_id_combinations,
             real (c_double)           :: factors(*)
         end subroutine
 
-        type (c_ptr) function channel_new() bind(c, name = 'pineappl_channel_new')
+        type (c_ptr) function channels_new() bind(c, name = 'pineappl_channels_new')
             use iso_c_binding
         end function
 
@@ -481,7 +481,7 @@ subroutine lumi_entry(lumi, entry, pdg_ids, factors) bind(c, name = 'pineappl_lu
             real (c_double)           :: factors(*)
         end subroutine
 
-        subroutine channel_entry(lumi, entry, pdg_ids, factors) bind(c, name = 'pineappl_channel_entry')
+        subroutine channels_entry(lumi, entry, pdg_ids, factors) bind(c, name = 'pineappl_channels_entry')
             use iso_c_binding
             type (c_ptr), value       :: lumi
             integer (c_size_t), value :: entry
@@ -524,10 +524,10 @@ function c_f_string(c_str) result(f_str)
         end do
     end function
 
-    type (pineappl_lumi) function pineappl_channel_new()
+    type (pineappl_lumi) function pineappl_channels_new()
         implicit none
         
-        pineappl_channel_new = pineappl_lumi(channel_new())
+        pineappl_channels_new = pineappl_lumi(channels_new())
     end function
 
     integer function pineappl_grid_bin_count(grid)
@@ -1135,7 +1135,7 @@ subroutine pineappl_lumi_add(lumi, combinations, pdg_id_pairs, factors)
         call lumi_add(lumi%ptr, int(combinations, c_size_t), pdg_id_pairs, factors)
     end subroutine
 
-    subroutine pineappl_channel_add(channels, combinations, nb_combinations, pdg_id_combinations, factors)
+    subroutine pineappl_channels_add(channels, combinations, nb_combinations, pdg_id_combinations, factors)
         use iso_c_binding
 
         implicit none
@@ -1145,7 +1145,7 @@ subroutine pineappl_channel_add(channels, combinations, nb_combinations, pdg_id_
         integer, dimension(2 * combinations), intent(in) :: pdg_id_combinations
         real (dp), dimension(combinations), intent(in)   :: factors
 
-        call channel_add(channels%ptr, int(combinations, c_size_t), int(nb_combinations, c_size_t), pdg_id_combinations, factors)
+        call channels_add(channels%ptr, int(combinations, c_size_t), int(nb_combinations, c_size_t), pdg_id_combinations, factors)
     end subroutine
 
     integer function pineappl_lumi_combinations(lumi, entry)
@@ -1190,7 +1190,7 @@ subroutine pineappl_lumi_entry(lumi, entry, pdg_ids, factors)
         call lumi_entry(lumi%ptr, int(entry, c_size_t), pdg_ids, factors)
     end subroutine
 
-    subroutine pineappl_channel_entry(lumi, entry, pdg_ids, factors)
+    subroutine pineappl_channels_entry(lumi, entry, pdg_ids, factors)
         use iso_c_binding
 
         implicit none
@@ -1200,7 +1200,7 @@ subroutine pineappl_channel_entry(lumi, entry, pdg_ids, factors)
         integer, intent(out)             :: pdg_ids(*)
         real (dp), intent(out)           :: factors(*)
 
-        call channel_entry(lumi%ptr, int(entry, c_size_t), pdg_ids, factors)
+        call channels_entry(lumi%ptr, int(entry, c_size_t), pdg_ids, factors)
     end subroutine
 
     type (pineappl_lumi) function pineappl_lumi_new()
diff --git a/examples/fortran/test_v1.f90 b/examples/fortran/test_v1.f90
index b7961173..85c4544a 100644
--- a/examples/fortran/test_v1.f90
+++ b/examples/fortran/test_v1.f90
@@ -22,8 +22,8 @@ program test_pineappl
     type (pineappl_xfx)    :: xfx1, xfx2
     type (pineappl_alphas) :: alphas
 
-    channels = pineappl_channel_new()
-    call pineappl_channel_add(channels, 3, 2, [0, 0, 1, -1, 2, -2], [1.0_dp, 1.0_dp, 1.0_dp])
+    channels = pineappl_channels_new()
+    call pineappl_channels_add(channels, 3, 2, [0, 0, 1, -1, 2, -2], [1.0_dp, 1.0_dp, 1.0_dp])
     
     if (pineappl_lumi_count(channels) /= 1) then
         write(*, *) "pineappl_lumi_count(): ", pineappl_lumi_count(channels)
diff --git a/pineappl_capi/src/lib.rs b/pineappl_capi/src/lib.rs
index dc423a7c..7ee339ab 100644
--- a/pineappl_capi/src/lib.rs
+++ b/pineappl_capi/src/lib.rs
@@ -1396,19 +1396,21 @@ pub extern "C" fn pineappl_channels_new() -> Box<Lumi> {
 /// # Safety
 ///
 /// The parameter `lumi` must point to a valid `Lumi` object created by `pineappl_lumi_new`.
-/// `pdg_id_combinations` must be an array with length `n_combinations * combinations`, and
-/// `factors` with length of `combinations`.
+/// `pdg_id_combinations` must be an array with length `nb_combinations * combinations`, and
+/// `factors` with length of `combinations`. The `nb_convolutions` describe the number of
+/// parton distributions involved, while `combinations` represent the number of different
+/// channel combinations.
 #[no_mangle]
 pub unsafe extern "C" fn pineappl_channels_add(
     channels: *mut Lumi,
     combinations: usize,
-    nb_combinations: usize,
+    nb_convolutions: usize,
     pdg_id_combinations: *const i32,
     factors: *const f64,
 ) {
     let channels = unsafe { &mut *channels };
     let pdg_id_pairs =
-        unsafe { slice::from_raw_parts(pdg_id_combinations, nb_combinations * combinations) };
+        unsafe { slice::from_raw_parts(pdg_id_combinations, nb_convolutions * combinations) };
     let factors = if factors.is_null() {
         vec![1.0; combinations]
     } else {
@@ -1417,9 +1419,9 @@ pub unsafe extern "C" fn pineappl_channels_add(
 
     channels.0.push(Channel::new(
         pdg_id_pairs
-            .chunks(nb_combinations)
+            .chunks(nb_convolutions)
             .zip(factors)
-            .map(|x| ((0..nb_combinations).map(|i| x.0[i]).collect(), x.1))
+            .map(|x| ((0..nb_convolutions).map(|i| x.0[i]).collect(), x.1))
             .collect(),
     ));
 }