diff --git a/pitfall/pitfall/color.rkt b/pitfall/pitfall/color.rkt
index ed66dde7..351244e2 100644
--- a/pitfall/pitfall/color.rkt
+++ b/pitfall/pitfall/color.rkt
@@ -60,12 +60,12 @@
          (set-color-space color-space stroke)
        
          ;; 181126 don't round, to be consistent with pdfkit behavior
-         (send this addContent (format "~a ~a" (string-join (map (λ (num) (numberizer num #:round #false)) color) " ") op))
+         (send this add-content (format "~a ~a" (string-join (map (λ (num) (numberizer num #:round #false)) color) " ") op))
          #true]))
     
     (define/public (set-color-space space stroke)
       (define op (if stroke "CS" "cs"))
-      (send this addContent (format "/~a ~a" space op)))
+      (send this add-content (format "/~a ~a" space op)))
 
     (define/public (fill-color color [opacity 1])
       (unless (normalize-color color)
@@ -110,7 +110,7 @@
                        (set! @opacity-count (add1 @opacity-count))
                        (list ref-dict (format "Gs~a" @opacity-count)))))
         (hash-set! (send (send this page) ext_gstates) name dictionary)        
-        (send this addContent (format "/~a gs" name))))))
+        (send this add-content (format "/~a gs" name))))))
 
 (define named-colors
   (hash "aliceblue" '(240 248 255)
diff --git a/pitfall/pitfall/document.rkt b/pitfall/pitfall/document.rkt
index 6038aa53..fc5d96f7 100644
--- a/pitfall/pitfall/document.rkt
+++ b/pitfall/pitfall/document.rkt
@@ -27,7 +27,7 @@
                              (super-new)
                              (field [@pages null])
                              (define/public (page) (first @pages))                  
-                             (define/public (addContent data)
+                             (define/public (add-content data)
                                (send (first @pages) write data)
                                this))))))))
     (set-current-ref-id! 1)
diff --git a/pitfall/pitfall/images.rkt b/pitfall/pitfall/images.rkt
index bd48ec8e..560fdd87 100644
--- a/pitfall/pitfall/images.rkt
+++ b/pitfall/pitfall/images.rkt
@@ -88,7 +88,7 @@
       (when (= @y y) (set! y (+ y h)))
       (send this save)
       (send this transform w 0 0 (- h) x (+ y h))
-      (send this addContent (format "/~a Do" (get-field label image)))
+      (send this add-content (format "/~a Do" (get-field label image)))
       (send this restore)
       this)
 
diff --git a/pitfall/pitfall/text.rkt b/pitfall/pitfall/text.rkt
index 18bb7c0b..b1b53a20 100644
--- a/pitfall/pitfall/text.rkt
+++ b/pitfall/pitfall/text.rkt
@@ -31,7 +31,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
                    @pages)
     (inherit [@current-line-height current-line-height])
     (inherit save line-width move-to line-to stroke stroke-color transform restore) ; from vector
-    (inherit addContent) ; from base
+    (inherit add-content) ; from base
 
     (define/public (move-down [lines 1] #:factor [factor 1])
       (set! @y (+ @y (* factor (@current-line-height #t) (+ lines @line-gap))))
@@ -108,15 +108,15 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
       (hash-ref! (send (first @pages) fonts) current-font-id 
                  (λ () (send @current-font make-font-ref)))
   
-      (addContent "BT") ; begin the text object
-      (addContent (format "1 0 0 1 ~a ~a Tm" (numberizer x) (numberizer y))) ; text position
-      (addContent (format "/~a ~a Tf" current-font-id
+      (add-content "BT") ; begin the text object
+      (add-content (format "1 0 0 1 ~a ~a Tm" (numberizer x) (numberizer y))) ; text position
+      (add-content (format "/~a ~a Tf" current-font-id
                                     (numberizer @current-font-size))) ; font and font size
       (let ([mode (+ (if (hash-ref options 'fill #f) 1 0) (if (hash-ref options 'stroke #f) 1 0))])
         (when (and mode (not (zero? mode)))
-          (addContent (format "~a Tr" mode))))
+          (add-content (format "~a Tr" mode))))
       (when (not (zero? character-spacing))
-        (addContent (format "~a Tc" character-spacing)))
+        (add-content (format "~a Tc" character-spacing)))
 
       ;; Add the actual text
       ;; 180321: the first call to this operation is very slow from Quad
@@ -141,7 +141,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
       (define (flush idx)
         (add-segment idx)
         (when (positive? (length commands))
-          (addContent (format "[~a] TJ" (string-join (reverse commands) " ")))
+          (add-content (format "[~a] TJ" (string-join (reverse commands) " ")))
           (set! commands empty)))
   
       (for/fold ([had-offset #f] [x x])
@@ -152,7 +152,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
             ;; so we can move the text position.
             [(or (not (zero? (glyph-position-x-offset posn))) (not (zero? (glyph-position-y-offset posn))))
              (flush idx)
-             (addContent ; Move the text position and flush just the current character
+             (add-content ; Move the text position and flush just the current character
                    (format "1 0 0 1 ~a ~a Tm"
                            (numberizer (+ x (* (glyph-position-x-offset posn) scale)))
                            (numberizer (+ y (* (glyph-position-y-offset posn) scale)))))
@@ -161,7 +161,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
             [else
              ;; If the last character had an offset, reset the text position
              (when had-offset
-               (addContent (format "1 0 0 1 ~a ~a Tm" (numberizer x) (numberizer y))))
+               (add-content (format "1 0 0 1 ~a ~a Tm" (numberizer x) (numberizer y))))
              ;; Group segments that don't have any advance adjustments
              (unless (zero? (- (glyph-position-x-advance posn) (glyph-position-advance-width posn)))
                (add-segment (add1 idx)))
@@ -169,5 +169,5 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
         (values having-offset (+ x (* (glyph-position-x-advance posn) scale))))
   
       (flush (vector-length positions))
-      (addContent "ET") ; end the text object
+      (add-content "ET") ; end the text object
       (restore)))) ; restore flipped coordinate system
diff --git a/pitfall/pitfall/vector.rkt b/pitfall/pitfall/vector.rkt
index e3e8635d..ff9e4dd8 100644
--- a/pitfall/pitfall/vector.rkt
+++ b/pitfall/pitfall/vector.rkt
@@ -18,12 +18,12 @@
     (super-new)
     (field [@ctm default-ctm-value]
            [@ctm-stack null])
-    (inherit addContent) ; from base
+    (inherit add-content) ; from base
     (inherit stroke-color fill-color) ; from color
 
     (define/public (save)
       (set! @ctm-stack (cons @ctm @ctm-stack))
-      (addContent "q"))
+      (add-content "q"))
 
     (define/public (restore)
       (set! @ctm (if (pair? @ctm-stack)
@@ -31,55 +31,55 @@
                        (car @ctm-stack)
                        (set! @ctm-stack (cdr @ctm-stack)))
                      default-ctm-value))
-      (addContent "Q"))
+      (add-content "Q"))
 
     (define/public (close-path)
-      (addContent "h"))
+      (add-content "h"))
 
     (define/public (line-cap [c #f])
       (define cap-styles (hasheq 'butt 0 'round 1 'square 2))
-      (addContent
+      (add-content
             (format "~a J" (if (symbol? c)
                                (hash-ref cap-styles c)
                                ""))))
 
     (define/public (line-join [j #f])
       (define cap-styles (hasheq 'miter 0 'round 1 'bevel 2))
-      (addContent
+      (add-content
             (format "~a j" (if (symbol? j)
                                (hash-ref cap-styles j)
                                ""))))
 
     (define/public (line-width w)
-      (addContent (format "~a w" (number w))))
+      (add-content (format "~a w" (number w))))
 
     (define/public (dash length [options (mhash)])
       (cond
         [(list? length)
-         (addContent
+         (add-content
                (format "[~a] ~a d"
                        (string-join (map number length) " ")
                        (hash-ref options 'phase 0)))]
         [length
          (define space (hash-ref options 'space length))
          (define phase (hash-ref options 'phase 0))
-         (addContent (format "[~a ~a] ~a d" (number length) (number space) (number phase)))] 
+         (add-content (format "[~a ~a] ~a d" (number length) (number space) (number phase)))] 
         [else this]))
 
     (define/public (move-to x y)
-      (addContent (format "~a ~a m" x y)))
+      (add-content (format "~a ~a m" x y)))
 
     (define/public (line-to x y)
-      (addContent (format "~a ~a l" x y)))
+      (add-content (format "~a ~a l" x y)))
 
     (define/public (bezier-curve-to cp1x cp1y cp2x cp2y x y)
-      (addContent (format "~a c" (string-join (map number (list cp1x cp1y cp2x cp2y x y)) " "))))
+      (add-content (format "~a c" (string-join (map number (list cp1x cp1y cp2x cp2y x y)) " "))))
 
     (define/public (quadratic-curve-to cpx cpy x y)
-      (addContent (format "~a v" (string-join (map number (list cpx cpy x y)) " "))))
+      (add-content (format "~a v" (string-join (map number (list cpx cpy x y)) " "))))
   
     (define/public (rect x y w h)
-      (addContent (format "~a re" (string-join (map number (list x y w h)) " "))))
+      (add-content (format "~a re" (string-join (map number (list x y w h)) " "))))
 
     (define/public (ellipse x y r1 [r2 r1])
       ;; based on http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas/2173084#2173084
@@ -123,27 +123,27 @@
 
     (define/public (fill [color #f] #:rule [rule #f])
       (when color (fill-color color)) ;; fill-color method is from color mixin
-      (addContent (format "f~a" (_windingRule rule))))
+      (add-content (format "f~a" (_windingRule rule))))
 
     (define/public (stroke [color #f])
       (when color (stroke-color color))
-      (addContent "S"))
+      (add-content "S"))
 
     (define/public (fill-and-stroke [fill #f] [stroke fill] #:rule [rule #f])
       (when fill (fill-color fill) (stroke-color stroke))
-      (addContent (format "B~a" (_windingRule rule))))
+      (add-content (format "B~a" (_windingRule rule))))
 
     (define tm/c (list/c number? number? number? number? number? number?))
     (define/public (make-transform-string ctm)
       (format "~a cm" (string-join (map number ctm) " ")))
 
     (define/public (clip [rule #f])
-      (addContent (string-append "W" (_windingRule rule) " n")))
+      (add-content (string-append "W" (_windingRule rule) " n")))
 
     (define/public (transform scaleX shearY shearX scaleY mdx mdy)
       (define new-ctm (list scaleX shearY shearX scaleY mdx mdy))
       (set! @ctm (combine-transforms (· this @ctm) new-ctm))
-      (addContent (make-transform-string new-ctm)))
+      (add-content (make-transform-string new-ctm)))
 
     (define/public (shear x y)
       (transform 1 y x 1 0 0))