diff --git a/docs/src/how-to/obc.md b/docs/src/how-to/obc.md
index 2dd14c1f..76dc9602 100644
--- a/docs/src/how-to/obc.md
+++ b/docs/src/how-to/obc.md
@@ -27,7 +27,7 @@ using MacroModelling
 @model Gali_2015_chapter_3_obc begin
     W_real[0] = C[0] ^ σ * N[0] ^ φ
 
-    [0] = β * (C[1] / C[0]) ^ (-σ) * Z[1] / Z[0] / Pi[1]
+    Q[0] = β * (C[1] / C[0]) ^ (-σ) * Z[1] / Z[0] / Pi[1]
 
     R[0] = 1 / Q[0]