diff --git a/doc/design/compiler-assumptions.md b/doc/design/compiler-assumptions.md
index a1467f3bab..de17032fad 100644
--- a/doc/design/compiler-assumptions.md
+++ b/doc/design/compiler-assumptions.md
@@ -1,4 +1,4 @@
-# Compiler assumptions
+# Compiler Assumptions
 
 Babel and its associated official transforms make some assumptions about your code. These
 assumptions are only made as they're either **impossible** to take into consideration or
diff --git a/doc/design/compiler-environment-support.md b/doc/design/compiler-environment-support.md
index 3cb1afbe6e..7676ca811e 100644
--- a/doc/design/compiler-environment-support.md
+++ b/doc/design/compiler-environment-support.md
@@ -1,4 +1,4 @@
-# Compiler environment support
+# Compiler Environment Support
 
 **NOTE:** Compiler support does not dictate the runtime requirements of compiled code.