diff --git a/doc/ethapp_plugins.adoc b/doc/ethapp_plugins.adoc
index 61f6e0d..a3bdbbe 100644
--- a/doc/ethapp_plugins.adoc
+++ b/doc/ethapp_plugins.adoc
@@ -141,8 +141,8 @@ void copy_address(uint8_t* dst, const uint8_t* parameter, uint8_t dst_size);
 void copy_parameter(uint8_t* dst, const uint8_t* parameter, uint8_t dst_size);
 
 // Get the value from the beginning of the parameter (right to left) and check if the rest of it is zero
-bool U2BE_from_parameter(uint8_t* parameter, uint16_t* value);
-bool U4BE_from_parameter(uint8_t* parameter, uint32_t* value);
+bool U2BE_from_parameter(const uint8_t* parameter, uint16_t* value);
+bool U4BE_from_parameter(const uint8_t* parameter, uint32_t* value);
 ----
 
 ### ETH_PLUGIN_FINALIZE