diff --git a/src/libraries/turtle/error.hpp b/src/libraries/turtle/error.hpp
index a8ce8e2..25a19c4 100644
--- a/src/libraries/turtle/error.hpp
+++ b/src/libraries/turtle/error.hpp
@@ -64,7 +64,7 @@ namespace detail
         {
             ++detail::errors.count_;
             static std::string m;
-            m = "mock error : unexpected call : " + context;
+            m = "mock error : sequence failed : " + context;
             throw mock::exception( m );
         }
 
diff --git a/src/libraries/turtle/verifiable.hpp b/src/libraries/turtle/verifiable.hpp
index 4f5ca3c..48da575 100644
--- a/src/libraries/turtle/verifiable.hpp
+++ b/src/libraries/turtle/verifiable.hpp
@@ -22,7 +22,7 @@ namespace mock
         // return false if verification fails
         virtual bool verify() = 0;
 
-        // return to the initial state where calling verify won't throw
+        // return to the initial state
         virtual void reset() = 0;
     };
 }