diff --git a/Heisenberg-versus-Haldane-Shastry.md b/Heisenberg-versus-Haldane-Shastry.md
index f0ac339..4b2003d 100644
--- a/Heisenberg-versus-Haldane-Shastry.md
+++ b/Heisenberg-versus-Haldane-Shastry.md
@@ -2,7 +2,7 @@
 # Heisenberg versus Haldane-Shastry
 ## Description
 
-As I like to say, ""_all (regularizable) quantum models are integrable, but some are more integrable than others_"".
+As I like to say, "_all (regularizable) quantum models are integrable, but some are more integrable than others_".
 
 The idea of this project is to compare the _degree of integrability_ of two fundamental models:
 - the Heisenberg chain