1 files changed, 2 insertions, 2 deletions

diff --git a/ue4/mycpu/cinstruction.h b/ue4/mycpu/cinstruction.h
index 85122b4..b90563a 100644
--- a/ue4/mycpu/cinstruction.h
+++ b/ue4/mycpu/cinstruction.h
@@ -166,7 +166,7 @@ class CInstruction
      * @return registernumber
      * @globalvars none
      * @exception  CInstructionError
-     * @pre  none
+     * @pre  str != NULL
      * @post none
      */
     virtual const unsigned parseRegister(const std::string& str);
@@ -217,7 +217,7 @@ class CInstruction
      * @return -
      * @globalvars none
      * @exception  CInstructionError
-     * @pre  none
+     * @pre  cpu valid (memory, program, registers valid)
      * @post none
      */
     virtual void execute(CCPU<T> *cpu) = 0;