diff --git a/ferris/config.h b/ferris/config.h
index 2247e6e..fd5db43 100644
--- a/ferris/config.h
+++ b/ferris/config.h
@@ -36,6 +36,9 @@
 // achordion will avoid the worst
 #define PERMISSIVE_HOLD
 
+// caps word is great for defines
+#define BOTH_SHIFTS_TURNS_ON_CAPS_WORD
+
 //
 // remove some features we don't need
 //
diff --git a/ferris/rules.mk b/ferris/rules.mk
index 5fadd37..9c19aa4 100644
--- a/ferris/rules.mk
+++ b/ferris/rules.mk
@@ -13,5 +13,8 @@ SPACE_CADET_ENABLE = no
 GRAVE_ESC_ENABLE = no
 MUSIC_ENABLE = no
 
+# caps word is great for defines
+CAPS_WORD_ENABLE = yes
+
 # add achordion to improve home row modifiers
 SRC += achordion.c
diff --git a/planck/config.h b/planck/config.h
index b313b11..6c5ac3f 100644
--- a/planck/config.h
+++ b/planck/config.h
@@ -36,6 +36,9 @@
 // achordion will avoid the worst
 #define PERMISSIVE_HOLD
 
+// caps word is great for defines
+#define BOTH_SHIFTS_TURNS_ON_CAPS_WORD
+
 //
 // audio configuration
 //
diff --git a/planck/rules.mk b/planck/rules.mk
index 5fadd37..9c19aa4 100644
--- a/planck/rules.mk
+++ b/planck/rules.mk
@@ -13,5 +13,8 @@ SPACE_CADET_ENABLE = no
 GRAVE_ESC_ENABLE = no
 MUSIC_ENABLE = no
 
+# caps word is great for defines
+CAPS_WORD_ENABLE = yes
+
 # add achordion to improve home row modifiers
 SRC += achordion.c