diff --git a/README.md b/README.md
index b6866d574..5cda917f9 100644
--- a/README.md
+++ b/README.md
@@ -78,11 +78,7 @@ Please read GotoBLAS_01Readme.txt
 - **ARM Cortex-A57**: Experimental
 
 #### IBM zEnterprise System:
-- **Z13**: blas3 for double
-```
-     git checkout z13  
-     make USE_TRMM=1 
-```     
+- **Z13**: blas3 for double 
      
 
 ### Support OS:
diff --git a/kernel/Makefile.L3 b/kernel/Makefile.L3
index 8e6827424..4b752d2ef 100644
--- a/kernel/Makefile.L3
+++ b/kernel/Makefile.L3
@@ -40,6 +40,10 @@ ifeq ($(CORE), POWER8)
 USE_TRMM = 1
 endif
 
+ifeq ($(CORE), Z13)
+USE_TRMM = 1
+endif
+