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diff --git a/INSTALL.md b/INSTALL.md
index db7a6e5..9b10339 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -181,6 +181,12 @@ or
 
 ## Optimizing performance
 
+### Profiling
+
+The gcc version has profiling support, run with
+
+    make PROFILING=1
+
 ### OpenBlas
 
 Linking against a built-from-source OpenBlas is a first optimization