diff --git a/systems/cello/e12/dune b/systems/cello/e12/dune
index 001c8a2..dd1a495 100644
--- a/systems/cello/e12/dune
+++ b/systems/cello/e12/dune
@@ -1,8 +1,9 @@
 (library
  (name fingerboard_cello_system_e12)
  (flags
+  :standard
   -w
-  +a-4-40-41-42-44-66
+  +a-4-40-41-42-44-45-66
   -warn-error
   +a
   -open
@@ -14,4 +15,4 @@
  (libraries base fingerboard stdio textutils.ascii_table)
  (inline_tests)
  (preprocess
-  (pps ppx_jane)))
+  (pps ppx_jane ppx_js_style -check-doc-comments)))
diff --git a/systems/cello/e53/dune b/systems/cello/e53/dune
index 31eafd2..1038751 100644
--- a/systems/cello/e53/dune
+++ b/systems/cello/e53/dune
@@ -1,8 +1,9 @@
 (library
  (name fingerboard_cello_system_e53)
  (flags
+  :standard
   -w
-  +a-4-40-41-42-44-66
+  +a-4-40-41-42-44-45-66
   -warn-error
   +a
   -open
@@ -14,4 +15,4 @@
  (libraries base fingerboard stdio textutils.ascii_table)
  (inline_tests)
  (preprocess
-  (pps ppx_jane)))
+  (pps ppx_jane ppx_js_style -check-doc-comments)))
diff --git a/systems/cello/e55/dune b/systems/cello/e55/dune
index 09b3073..52bced9 100644
--- a/systems/cello/e55/dune
+++ b/systems/cello/e55/dune
@@ -1,8 +1,9 @@
 (library
  (name fingerboard_cello_system_e55)
  (flags
+  :standard
   -w
-  +a-4-40-41-42-44-66
+  +a-4-40-41-42-44-45-66
   -warn-error
   +a
   -open
@@ -14,4 +15,4 @@
  (libraries base fingerboard stdio textutils.ascii_table)
  (inline_tests)
  (preprocess
-  (pps ppx_jane)))
+  (pps ppx_jane ppx_js_style -check-doc-comments)))
diff --git a/systems/cello/just/dune b/systems/cello/just/dune
index 3296bf4..a4965f0 100644
--- a/systems/cello/just/dune
+++ b/systems/cello/just/dune
@@ -1,8 +1,9 @@
 (library
  (name fingerboard_cello_system_just)
  (flags
+  :standard
   -w
-  +a-4-40-41-42-44-66
+  +a-4-40-41-42-44-45-66
   -warn-error
   +a
   -open
@@ -14,4 +15,4 @@
  (libraries base fingerboard stdio textutils.ascii_table)
  (inline_tests)
  (preprocess
-  (pps ppx_jane)))
+  (pps ppx_jane ppx_js_style -check-doc-comments)))
diff --git a/systems/cello/pythagorean/dune b/systems/cello/pythagorean/dune
index 6941a03..05433e9 100644
--- a/systems/cello/pythagorean/dune
+++ b/systems/cello/pythagorean/dune
@@ -1,8 +1,9 @@
 (library
  (name fingerboard_cello_system_pythagorean)
  (flags
+  :standard
   -w
-  +a-4-40-41-42-44-66
+  +a-4-40-41-42-44-45-66
   -warn-error
   +a
   -open
@@ -14,4 +15,4 @@
  (libraries base fingerboard stdio textutils.ascii_table)
  (inline_tests)
  (preprocess
-  (pps ppx_jane)))
+  (pps ppx_jane ppx_js_style -check-doc-comments)))