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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ Sample program to embed messages into PNG images
 
 ## Install
 
+**NOTE:** Set the core_count variable to one value lower than maximum cores on the host in cmd/pspng.c
+
 Requires zlib, pthread, and sodium header files to compile (These will be distro specific packages)
 
 Build: