diff --git a/src/lib/openjp2/j2k.c b/src/lib/openjp2/j2k.c
index 8e59f8b5..b16b8fe0 100644
--- a/src/lib/openjp2/j2k.c
+++ b/src/lib/openjp2/j2k.c
@@ -11876,7 +11876,7 @@ OPJ_BOOL opj_j2k_encode(opj_j2k_t * p_j2k,
                 }
             }
         }
-        l_current_tile_size = opj_tcd_get_encoded_tile_size(p_j2k->m_tcd);
+        l_current_tile_size = opj_tcd_get_encoder_input_buffer_size(p_j2k->m_tcd);
         if (!l_reuse_data) {
             if (l_current_tile_size > l_max_tile_size) {
                 OPJ_BYTE *l_new_current_data = (OPJ_BYTE *) opj_realloc(l_current_data,
diff --git a/src/lib/openjp2/tcd.c b/src/lib/openjp2/tcd.c
index c5640066..bca82423 100644
--- a/src/lib/openjp2/tcd.c
+++ b/src/lib/openjp2/tcd.c
@@ -2349,7 +2349,7 @@ static void opj_tcd_code_block_enc_deallocate(opj_tcd_precinct_t * p_precinct)
     }
 }
 
-OPJ_SIZE_T opj_tcd_get_encoded_tile_size(opj_tcd_t *p_tcd)
+OPJ_SIZE_T opj_tcd_get_encoder_input_buffer_size(opj_tcd_t *p_tcd)
 {
     OPJ_UINT32 i;
     OPJ_SIZE_T l_data_size = 0;
@@ -2617,7 +2617,7 @@ OPJ_BOOL opj_tcd_copy_tile_data(opj_tcd_t *p_tcd,
     OPJ_UINT32 l_size_comp, l_remaining;
     OPJ_SIZE_T l_nb_elem;
 
-    l_data_size = opj_tcd_get_encoded_tile_size(p_tcd);
+    l_data_size = opj_tcd_get_encoder_input_buffer_size(p_tcd);
     if (l_data_size != p_src_length) {
         return OPJ_FALSE;
     }
diff --git a/src/lib/openjp2/tcd.h b/src/lib/openjp2/tcd.h
index e3214c1d..67739170 100644
--- a/src/lib/openjp2/tcd.h
+++ b/src/lib/openjp2/tcd.h
@@ -415,9 +415,11 @@ OPJ_BOOL opj_tcd_update_tile_data(opj_tcd_t *p_tcd,
                                   OPJ_UINT32 p_dest_length);
 
 /**
- *
+ * Get the size in bytes of the input buffer provided before encoded.
+ * This must be the size provided to the p_src_length argument of
+ * opj_tcd_copy_tile_data()
  */
-OPJ_SIZE_T opj_tcd_get_encoded_tile_size(opj_tcd_t *p_tcd);
+OPJ_SIZE_T opj_tcd_get_encoder_input_buffer_size(opj_tcd_t *p_tcd);
 
 /**
  * Initialize the tile coder and may reuse some meory.
@@ -433,6 +435,8 @@ OPJ_BOOL opj_tcd_init_encode_tile(opj_tcd_t *p_tcd,
 
 /**
  * Copies tile data from the given memory block onto the system.
+ *
+ * p_src_length must be equal to opj_tcd_get_encoder_input_buffer_size()
  */
 OPJ_BOOL opj_tcd_copy_tile_data(opj_tcd_t *p_tcd,
                                 OPJ_BYTE * p_src,