diff --git a/logicals.qmd b/logicals.qmd
index 8dbbe03..fae4462 100644
--- a/logicals.qmd
+++ b/logicals.qmd
@@ -210,7 +210,7 @@ For example, `df |> filter(!is.na(x))` finds all rows where `x` is not missing a
 #| echo: false
 #| out-width: NULL
 #| fig-cap: > 
-#|    The complete set of boolean operations. `x` is the left-hand
+#|    The complete set of Boolean operations. `x` is the left-hand
 #|    circle, `y` is the right-hand circle, and the shaded region show 
 #|    which parts each operator selects.
 #| fig-alt: >