diff --git a/data-visualize.qmd b/data-visualize.qmd
index 8367f25..08fa9cc 100644
--- a/data-visualize.qmd
+++ b/data-visualize.qmd
@@ -436,7 +436,7 @@ We finally have a plot that perfectly matches our "ultimate goal"!
       )
     ```
 
-## ggplot2 calls
+## ggplot2 calls {#sec-ggplot2-calls}
 
 As we move on from these introductory sections, we'll transition to a more concise expression of ggplot2 code.
 So far we've been very explicit, which is helpful when you are learning:
diff --git a/layers.qmd b/layers.qmd
index fa0882a..8e15ac9 100644
--- a/layers.qmd
+++ b/layers.qmd
@@ -994,7 +994,7 @@ There are two other coordinate systems that are occasionally helpful.
 
 ## The layered grammar of graphics
 
-We can expand on the graphing template you learned in @sec-graphing-template by adding position adjustments, stats, coordinate systems, and faceting:
+We can expand on the graphing template you learned in @sec-ggplot2-calls by adding position adjustments, stats, coordinate systems, and faceting:
 
     ggplot(data = <DATA>) + 
       <GEOM_FUNCTION>(