diff --git a/meta-parsec/README.md b/meta-parsec/README.md
index c5635d3..bb4c2b9 100644
--- a/meta-parsec/README.md
+++ b/meta-parsec/README.md
@@ -80,7 +80,7 @@ Manual testing with runqemu
   This layer also contains a recipe for pasec-tool which can be used for
 manual testing of the Parsec service:
 
-    IMAGE_INSTALL:append += " parsec-tools"
+    IMAGE_INSTALL:append = " parsec-tools"
 
   There are a series of Parsec Demo videos showing how to use parsec-tool
 to test the Parsec service base functionality:
@@ -104,7 +104,7 @@ enabled. No changes required.
   The Software HSM can be used for manual testing of the provider by
 including it into your test image:
 
-    IMAGE_INSTALL:append += " softhsm"
+    IMAGE_INSTALL:append = " softhsm"
 
 Inside the running VM:
 - Stop Parsec
@@ -135,7 +135,7 @@ systemctl start parsec
   The IBM Software TPM service can be used for manual testing of the provider by
 including it into your test image:
 
-    IMAGE_INSTALL:append += " ibmswtpm2 tpm2-tools libtss2 libtss2-tcti-mssim"
+    IMAGE_INSTALL:append = " ibmswtpm2 tpm2-tools libtss2 libtss2-tcti-mssim"
 
 Inside the running VM:
 - Stop Parsec